Controls whether the ad highlight is annotated with a label describing the
 type of ad such as popup, sticky, or video.

 Controls whether to include information about the page's open popup in
 AIPageContent.

 Controls whether a missing subframe while generating the APC proto is
 silently dropped. If false, the entire APC is considered failed when this
 happens. When true, the subframe is simply skipped but the rest of APC
 generation is unaffected.

 Enables URN URLs like those produced by Protected Audience auctions to be
 displayed by iframes (instead of requiring fenced frames).

 Blocks the grammar suggestion span in composition mode.

 Blocks the misspelling suggestion span in composition mode.

 Capture Android key event objects to send them to the web contents when the
 IME sends composition texts.

 DevTools frontend for Android.

 Enables media to continue playing in the background.

 Fallback to next named service slot if launching a privileged service process
 hangs. In practice, this means if GPU launch hanges, then retry it once.

 Forces an active text input state update calculation and push from the
 renderer process to browser whenever an editable view container gains focus.

 Enables IMEs to insert media content such as images, gifs and stickers.

 Enables a blur animation of the current page when navigating away from it.

 Enables the physical keyboard autocorrect underline feature.

 Enables the physical keyboard autocorrect underline feature V2.

 Removes the setLocalFocus workaround and delay for multi-display setups on
 Baklava and above.

 Replay captured KEYCODE_DEL key down events when the IME deletes surrounding
 text.

 Warm up a spare renderer after each navigation on Android.

 Controls whether AOM/VPX decoders should use the presentation thread type.

 Used to add an artificial delay for UI rendering during testing and
 debugging.

 Whether to allow attaching an inner WebContents not owned by the outer
 WebContents. This is for prototyping purposes and should not be enabled in
 production.

 Enables flash to be ducked by audio focus. This is enabled on Chrome OS which
 has audio focus enabled.

 Immediately pauses AudioRendererMixer's underlying output sink when all
 inputs are removed on explicit player pauses instead of waiting for the
 10-second mixer pause delay.

 Runs the audio service in a separate process.

 Enables the audio-service sandbox. This feature has an effect only when the
 kAudioServiceOutOfProcess feature is enabled.

 Controls whether JavaScript execution inside AudioWorkletProcessor::Process()
 runs under strict IEEE-754 floating-point semantics (disabling FTZ/DAZ).
 Enabled by default as a remote kill-switch.

 A thread pool system for effective usage of RealtimeAudioWorkletThread
 instances.

 A server-side switch for the kRealtimeAudio thread type of
 RealtimeAudioWorkletThread object. This can be controlled by a field trial,
 it will use the kNormal type thread when disabled.

 If enabled, we start forwarding submissions with source
 DOM_MUTATION_AFTER_AUTOFILL, even for non-password forms.

 LINT.IfChange(autofill_across_iframes_ios_throttling)
 Throttles child frame extraction to a maximum number of child frames that
 can be extracted by applying the following rules: (1) remove the child frames
 from an individual form that busts the limit and (2) stop extracting child
 frames on other forms once the limit is reached across forms.

 Controls whether to trigger form extraction when detecting a form activity on
 a xframe form.

 When enabled, the extracted APC proto includes node geometry.

 If enabled, ActorFormFillingServiceImpl will attempt to split requests for a
 form section fill (when relevant) into two sub-fills - one for a "contact
 info" sub-section and one for an "address" sub-section.

 Kill switch: If enabled, ChromeAutofillClient may enter the actor mode,
 changing how the UI, parsing and the server predictions work. For more
 context see: go/autofill-actor-mode-implementation

 Controls whether to rewrite the credit card trigger field to the first
 credit card number field in the same section.

 Controls whether all import tasks are suppressed when an Actor task is
 active on the tab in question. This also suppresses silent updates and
 saving to Autocomplete.

 Feature flag to control displaying of Autofill suggestions on
 unclassified fields based on prefix matching. These suggestions are displayed
 after the user typed a certain number of characters that match some data
 stored in the user's profile.
 TODO(crbug.com/381994105): Cleanup when launched.

 Feature flag to controls whether Autofill on typing suggestions will have a
 strike database.

 Feature flag controlling the display of surveys when a user declines the
 save prompt of Autofill address and a user does not have any address stored.
 The goal is to understand the reason and work towards improving acceptance.

 Feature flag controlling the display of surveys when a user does not
 accept an Autofill suggestion. The goal is to understand the reason and work
 towards improving acceptance.

 If enabled (and if AutofillAiServerModel is also enabled), this ignores
 the may_run_server_model boolean sent by the Autofill server and, instead,
 queries the server model for every encountered form that is not already
 cached locally.
 Only intended for testing.

 If enabled, no GeoIp requirements are imposed for AutofillAi.
 Note that this feature can be modified as follows (all assuming that
 kAutofillAiIgnoreGeoIp is enabled):
 - If both kAutofillAiIgnoreGeoIpAllowlist and
   kAutofillAiIgnoreGeoIpBlocklist are empty, then all geo IPs are
   permitted.
 - If only kAutofillAiIgnoreGeoIpBlocklist is non-empty, then all geo ips
   but those in kAutofillAiIgnoreGeoIpBlocklist are permitted.
 - If kAutofillAiIgnoreGeoIpAllowlist is non-empty, then only geo ips in
   kAutofillAiIgnoreGeoIpAllowlist are permitted.

 Both the allowlist and the blocklist are expected to consist of
 comma-separated uppercase two-digit country codes (see documentation of
 GeoIpCountryCode.)

 When enabled, the entity-specific import constraints are enforced for data
 received through AUTOFILL_VALUABLE.
 TODO(crbug.com/542468992): Clean up when launched.

 If enabled, Autofill AI suggestion width can be limited.

 If enabled, Autofill AI will use a new update prompt on Desktop that shows
 both the previous and the new value of an updated entity attribute.

 If enabled, Autofill AI filling suggestion do not have an icon.

 If enabled, Autofill AI Settings Page title uses "Smarter form understanding"
 instead of "Enhanced autofill".

 If enabled, AutofillAi supports order entities.

 When inference through the non-PI AutofillAi online model is run (implying
 that AutofillAiUsePrivateAi is disabled) and this flag is enabled, an
 additional inference request through the PI stack is run to compute shadow
 metrics between the two results.

 When enabled, a HaTS survey is shown after the save prompt for a walletable
 entity was interacted with.

 If enabled, AutofillAi supports shipment entities.

 Controls whether a banner is shown in settings when wallet data sharing is
 disabled.

 If enabled, the client may trigger the server model for AutofillAI type
 predictions using Private AI Compute.

 Enables the 2026 Autofill AI Wallet Pass Branding Updates.

 When enabled, account-related eligibility criteria (minor status, location)
 are determined based on a capability, rather than approximated through
 signals that were readily available in Chrome prior to the Autofill-specific
 capability (e.g., using geo-location).

 If enabled, Wallet private pass entries in settings link to their pass
 details page rather than the generic pass overview page.

 If enabled, Wallet management URLs (pass_view_url) are used for deep
 linking to Google Wallet. Note that the processing of pass_view_url
 in Chrome sync happens unconditionally even if the feature is off.

 When enabled, orders and shipments from Google Wallet become available in
 Autofill for filling as read-only AutofillAi entities.
 TODO(crbug.com/542022094): Clean up when launched.

 When enabled, autofill will fill not skip filling fields that had an initial
 value which was modified.

 When enabled, the ambient autofill experience is enabled in Chrome.

 Controls whether Personal Context entities without attached sources are
 filtered out during Ambient Autofill prefetch validation.

 When enabled, Personal Context Autofill AI suggestions display detailed
 source info submenus on Desktop.

 Controls whether the spii cache is enabled for Ambient Autofill.

 Controls whether pContext suggestion suppression in Ambient Autofill is
 enabled, including the UI to suppress suggestions.

 If enabled, on Android desktop, the Autofill keyboard accessory will have a
 new behavior and design.
 TODO(crbug.com/438125774): Remove when launched.

 If enabled, on Android desktop, Autofill keyboard accessory will be
 suppressed when there are no autofill suggestions.

 Controls whether user tap on an element is needed to show autofill
 suggestions. If enabled, this flag would disable android autofill suggestions
 if the focus on an element is Javascript-originated.
 DidReceiveLeftMouseDownOrGestureTapInNode() will show suggestions if the
 focus change occurred as a result of a gesture. See crbug.com/730764 for why
 showing autofill suggestions as a result of JavaScript changing focus is
 enabled on WebView.
 TODO(crbug.com/40286775) Clean up autofill feature flag
 kAutofillAndroidDisableSuggestionsOnJSFocus

 If enabled, on Android, the Autofill keyboard accessory will not be
 displayed attached to the keyboard but will be placed below or above the
 focused field. It works only for large form factor devices like tablets or
 desktops.
 TODO(crbug.com/438125774): Remove when launched.

 If enabled, on Android, form comparisons are done by comparing
 FormGlobalIds instead of checking form similarity via SimilarFormAs().

 Feature flag for kAutofillAtMemory.

 If enabled, AtMemory can be triggered by pressing Ctrl twice.

 Controls whether the Autosuggest nudging logic is used. If enabled, user are
 encouraged to use the AtMemory feature.

 Controls whether the previously filled suggestions from AtMemory are shown.
 Takes no effect when kAutofillAtMemorySearchStatefulness is disabled.

 When enabled, preserves the active AtMemory search query and fetched
 suggestions when the popup is dismissed, restoring them if the user reopens
 suggestions on the same field. State is reset once a suggestion is accepted
 or a different field is focused.

 Controls whether contenteditable fields on Android are supported for
 AtMemory.

 Controls whether <textarea> fields on Android are supported for AtMemory.
 When enabled, the keyboard accessory is shown on textareas with only the
 AtMemory entry point, and regular Autofill suggestions are not generated
 for them.

 If enabled, AtMemory can be triggered with a keyboard shortcut like
 Ctrl+Space.

 If enabled, AtMemory can be triggered by typing the trigger string like "@@".

 When enabled, the placeholder is not considered a label fallback on the
 renderer side anymore. Instead, local heuristic will match regexes against
 either the label or the placeholder, depending on how high quality the label
 is. If no matche is found, local heuristics fall back to the other value.
 This feature can be thought of as "lightweight" multi-label support.
 TODO(crbug.com/320965828): Remove when launched.

 Check that between the time a filling flow is triggered and the popup being
 displayed, the field id to anchor the popup on did not change.
 TODO(crbug.com/8233280): This is a kill-switch feature, remove once we are
 sure no bug was introduced.

 When enabled, deduce country of a new address profile based on the phone
 number if not explicitly observed.

 If enabled, FormPredictionsTracker will wait up to 1 second
 for Autofill to finish parsing forms pesent on a given tab before capturing
 APC. For more context see: go/autofill-actor-mode-implementation
 TODO(crbug.com/479794574): Convert to killswitch if no regressions are
 spotted.

 Kill switch for Autofill address import.

 Kill switch for Autofill filling.

 When enabled, always use the country name and never fill country codes. When
 disabled, fill country codes on autocomplete="country".

 LINT.IfChange(autofill_disallow_more_hyphen_like_labels)
 When enabled, the list of characters a label cannot exclusively consist of
 includes more hyphen-like characters: em-dash, minus sign and fullwidth
 hyphen-minus.
 TODO(crbug.com/440039204): Remove when launched.

 Controls an ablation study in which autofill for addresses and payment data
 can be suppressed.

 Enables a new implementation for address field parsing that is based on
 backtracking.

 When enabled, Autofill will support per domain and per data type enterprise
 policy.

 When enabled, the height of the autofill popup is limited to show a fixed
 maximum number of entries.

 When enabled, IBAN regex pattern matching is expanded to support more
 formats.

 Enables a couple of improvements to credit card expiration date handling:
 - The autocomplete attribute values are rationalized with format strings
   like MM/YY from placeholders and labels in mind.
 - more fill follow.
 TODO(crbug.com/40266396): Remove once launched.

 Control if Autofill supports German transliteration.
 TODO(crbug.com/328968064): Remove when/if launched.

 If enabled, the import of unchanged values for ADDRESS_HOME_COUNTRY and
 ADDRESS_HOME_STATE fields is enabled.
 TODO(crbug.com/40137859): Remove once launched.

 Controls whether to save the first number in a form with multiple phone
 numbers instead of aborting the import.
 TODO(crbug.com/40742746) Remove once launched.

 When enabled, the Keyboard Accessory on Android will be shown for search
 fields if any filling sources (e.g. fallback sheets or autofill) are
 available.

 When enabled, Autofill will help users fill in non-affiliated loyalty cards
 on loyalty card only fields.

 When enabled, Autofill will use heuristics to identify OTP fields.

 Kill switch: If enabled, AutofillField may not suppress suggestions on
 field that has autocomplete=unrecognized attribute.

 If enabled, the missing merge modes will be re-enabled on nodes. To do that,
 MergeMode::kMergeChildrenAndReformatIfNeeded will be also added to all the
 nodes where required.
 TODO(crbug.com/447111009): Remove when launched.

 When enabled, shows the Wallet Disclosure Notice after submitting a form with
 a public pass.

 When enabled, shows the Wallet Reminder Notice after submitting a form with a
 non-private (public) pass.

 Controls whether Autofill clears format strings assigned to a field where
 none of the assigned field types are compatible with it.

 Enables extended zip code validation.
 TODO(crbug.com/434140055): Clean up when launched.

 If enabled, only non-ad frames are extracted.
 Otherwise, non-ad frames as well as visible ad frames are extracted.
 "Extracted" means that FormFieldData::child_frames is populated, which is
 necessary for flattening these forms.
 The forms in those frames are extracted either way.
 TODO(crbug.com/40196220): Remove once launched.

 When enabled, iframes are associated with the outermost ancestor form
 (analogous to form control ownership) rather than the closest ancestor form
 (analogous to form control association).
 TODO(crbug.com/536963555): Clean up when launched.

 Prioritizes ADDRESS_HOME_STREET_ADDRESS over postal code in inferred labels.
 See crbug.com/540151895.

 When enabled, the rewriter uses updated rewrite rules.
 TODO(crbug.com/445863287): Cleanup when launched.

 When enabled, the rationalization engine will fix misclassifications where
 a field is detected as a COUNTRY when it should be a STATE or vice versa.
 TODO(crbug.com/444180493): Cleanup when launched.

 Enables pre-launch metrics for one-time passwords (OTPs) received in Gmail.

 When enabled, Greek regexes are used for parsing in branded builds.

 When enabled, BrowserAutofillManager hides suggestions as soon as the
 renderer reports that the focus moved away from the field the suggestions
 were shown for (FocusOnFormField() for a different field or
 FocusOnNonFormField()). Without this, hiding relies on
 DidEndTextFieldEditing(), which Blink only sends for <input> elements, so
 suggestions shown for <textarea> or contenteditable elements leak into the
 keyboard accessory after the user taps away.
 TODO(crbug.com/570488818): Remove once the experiment is over.

 Keeps the Autofill popup open when layout reflow (kClamping or
 kAnchoring) produces a scroll event. The feature flag guards logic
 only on Desktop platforms.
 TODO(crbug.com/564353467): Remove once the experiment is over.

 When enabled, corrects missclassification of NAME_LAST as NAME_LAST_SECOND in
 an absence of NAME_LAST_FIRST.
 TODO(crbug.com/400995432): Clean-up when launched.

 If enabled, global rules are applied to rewrite empty string values like
 "null" to an empty string. These rules are applied for all types during
 address normalization.

 If enabled, Blink informs WebAutofillClient not only about keydown events on
 text-type <input> but also on <textarea> and contenteditables, and
 WebAutofillClient may default-handle any of these events.

 TODO(crbug.com/346507576): Remove once the experiment is over.
 When enabled, makes autocomplete label sensitive.

 If enabled, add autocomplete suggestions for email fields to the currently
 shown address suggestions if they are valid email addresses.
 TODO(crbug.com/506033768): Remove when launched.

 When enabled, all behaviours related to the on-device machine learning
 model for field type predictions will be guarded.
 TODO(crbug.com/40276177): Remove when launched.

 When Enabled Autofill server will stop applying small form rule and Chrome
 will take care of this logic.

 If enabled, the new suggestion generation logic is used.
 TODO(crbug.com/409962888): Remove once launched.

 When enabled, only single-field forms can be considered search forms (in
 addition to matching kUrlSearchActionRe on the form's action URL).
 TODO(crbug.com/566051797): Clean up when launched.

 When enabled, IsNormalizedNameVariantOf() uses a linear-time greedy
 algorithm instead of an exponential one that generates all name variants.
 TODO(crbug.com/479905438) Remove once launched.

 Enables detection of language from Translate.
 TODO(crbug.com/40158074): Cleanup when launched.

 When enabled, focusing on a credit card number field that was traditionally
 autofilled will yield all credit card suggestions.
 TODO(crbug.com/354175563): Remove when launched.

 If enabled, the user may be prompted a HaTS survey about the personalization
 experience and the perceived trust they have in the features.
 TODO(crbug.com/543741063): Transform to killswitch after some time.

 Controls whether Autofill may fill across origins.
 In payment forms, the cardholder name field is often on the merchant's origin
 while the credit card number and CVC are in iframes hosted by a payment
 service provider. By enabling the policy-controlled feature "autofill" in
 those iframes, the merchant's website enable Autofill to fill the credit card
 number and CVC fields from the cardholder name field, even though this
 autofill operation crosses origins.
 TODO(crbug.com/40178859): Enable this feature.

 Controls whether Autofill warns about manual text input in cross-origin
 frames.
 This feature lives in Autofill code because of its close relationship to
 kAutofillCrossOriginAutofill.
 TODO(crbug.com/40178859): Enable this feature.

 If the feature is enabled, before triggering suggestion acceptance, the row
 view checks that a substantial portion of its content was visible for some
 minimum required period.
 TODO(crbug.com/337222641): During cleaning up, in the popup row view remove
 emitting of "Autofill.AcceptedSuggestionDesktopRowViewVisibleEnough".

 If enabled, PopupBaseView uses DeleteSoon instead of synchronous
 delete this during DoHide() when no widget has been created, and
 guards against double destruction or showing while hiding.
 TODO(crbug.com/524084900): Remove when launched.

 Replaces blink::WebFormElementObserver usage in FormTracker by updated logic
 for tracking the disappearance of forms as well as other submission
 triggering events.
 TODO(crbug.com/40281981): Remove when launched.

 If enabled, AutofillPopupControllerImpl and
 AutofillKeyboardAccessoryControllerImpl require that the frame to which the
 suggestions are anchored has focus.
 TODO(crbug.com/536607604): Clean up when launched.

 Kill switch: If enabled, AutofillPopupControllerImpl and
 AutofillKeyboardAccessoryControllerImpl reset barrier_for_accepting_ when
 datalist values are updated via UpdateDataListValues().
 TODO(crbug.com/514074839): Clean up after Nov 3, 2026.

 TODO(crbug.com/435646513) - Clean-up after feature lands at 100% Stable.
 Enables the new experimental server-side signatures for evaluation purposes.

 Enables uploading of more data to the Autofill server to use for computing
 signatures: go/autofill-signatures-more-data.

 When enabled, autofill suggestions for one-time passwords (OTPs) from Gmail
 are shown.

 If enabled, fetch sms otp from gmscore and upload votes for sms otp.
 TODO(crbug.com/453999673): Clean up when launched.

 If this feature is enabled, the AddressFieldParser does NOT try to parse
 address lines once it has found a street name and house number or other
 combinations of fields that indicate that an address form uses structured
 addresses. This should be the default in all countries with fully supported
 structured addresses. However, if a country is not sufficiently modeled,
 autofill may still do the right thing if it recognizes "Street name, house
 number, address line 2" as a sequence.
 TODO(crbug.com/40266693) Remove once launched.

 Enables parsing of fields that combine postal code and city in France,
 e.g. a single field containing "75008 Paris".
 TODO(crbug.com/465119085): Clean up when launched.

 Enables splitting two-part zip codes into two fields while filling and
 importing split zip codes from two adjacent fields.
 TODO(crbug.com/369503318): Clean up when launched.

 When enabled, standalone zip code fields are classified by local heuristics
 globally, instead of just a handful of countries.

 Kill switch: When enabled, AskForValuesToFill() throttling is skipped for
 browser-initiated and explicit user triggers.
 TODO(crbug.com/547562303): Clean up after September 15, 2026.

 Mitigates side-channel brute-force probing of autofill data by rate-limiting
 AskForValuesToFill() invocations per RenderFrame via a token bucket.

 Enables tracking of user edits to <select> fields that were not autofilled.

 Enables using a custom address model for India, overriding the legacy one.

 When enabled, the form field parser won't try to match other attributes if
 any of the negative patterns matched.

 Kill switch: If enabled, use the original suggestion payload. If disabled,
 use a default GUID for payloads without a GUID [iOS specific].
 TODO(crbug.com/525996248): Remove after M154 branchpoint if there are no
 issues.

 Kill switch: If enabled, use the FormGlobalId and FieldGlobalId passed to
 AutofillExternalDelegate::Did{Select,Accept}Suggestion() instead of
 last_query_.

 Replaces the secondary signature with the structural signature for Uploads.
 For Queries still only the secondary (alternative) signature is used.
 TODO(crbug.com/431737839): Clean up when roll out finishes successfully.

 When enabled, FinalizeNameAddressComponent() wipes invalid name
 substructures regardless of the root node's verification status, and
 NameInfo::SetRawInfoWithVerificationStatus() invalidates child nodes when
 overwriting a non-empty full name with a non-token-equivalent value.

 Allows the AutoPictureInPictureTabHelper to automatically enter
 picture-in-picture when a webpage is occluded by another window.

 Enables showing auto picture-in-picture permission details in page info.

 Enables Happiness Tracking Surveys for Auto Picture-in-Picture.

 Allows media to autoplay without a user gesture if the site has been
 granted microphone or camera permissions.

 Whether we should show a setting to disable autoplay policy.

 Enables the Enterprise Autoplay policies (AutoplayAllowed and
 AutoplayAllowlist) on Android.

 https://crbug.com/1472970

 Whether we should allow color space changes to flush AcceleratedVideoDecoder.

 Avoids copying ResourceRequest::TrustedParams when possible.

 Enable using the BackForwardCache.

 When enabled, JavaScript network requests with "Cache-Control: no-store"
 headers from domains specified in kBackForwardCacheCCNSAllowedDomains will
 not disable Back/Forward cache.

 WHen this flag is enabled, the cookies modification without cookie value
 change will not cause eviction of the back/forward cache entries with
 Cache-control: no-store header.

 Set a time limit for the page to enter the cache. Disabling this prevents
 flakes during testing.

 BackForwardCacheMemoryControls is enabled only on Android to disable
 BackForwardCache for lower memory devices due to memory limitations.

 This is a kill switch for pausing microtask while the page is in the BFCache.
 Remove by m155 if things go well.

 Kill switch for Background Fetch.

 Enables Local Network Access checks for Background Fetch.

 Enable background resource fetch in Blink. See https://crbug.com/1379780 for
 more details.

 Used to configure a per-origin allowlist of performance.mark events that are
 permitted to be included in slow reports traces. See crbug.com/1181774.

 If enabled, skips over ad-related entries that were silently inserted into
 session history when navigating via back/forward buttons. This extends the
 existing history manipulation intervention logic.
 See https://crbug.com/375523824.

 Redefine the oklab and oklch spaces to have gamut mapping baked into them.
 https://crbug.com/1508329

 If enabled, makes battery saver request heavy align wake ups.

 TODO(https://crbug.com/327075943): Delete this.

 TODO(https://crbug.com/431875857): Delete this.

 Block all MIDI access with the MIDI_SYSEX permission

 Boost the priority of certain loading tasks (https://crbug.com/1470003).

 If enabled, force renderer process foregrounded from CommitNavigation to
 DOMContentLoad (crbug/351953350).

 Broker file operations on disk cache in the Network Service.
 This is no-op if the network service is hosted in the browser process.

 Enables Browser Initiated Automatic Picture-in-Picture (ChAP) in dry run
 mode.

 When enabled in dry run mode, all ChAP code paths are executed with the
 exception of actually opening the video PiP window, or any other paths that
 may be visible to the user experience. This flag will be used to enable
 analyzing the feature impact and catch early any potential regressions.

 Allows the decision to bypass redirect checks to be made based on the
 specific request.

 Allows pages with cache-control:no-store to enter the back/forward cache.
 Feature params can specify whether pages with cache-control:no-store can be
 restored if cookies change / if HTTPOnly cookies change.
 TODO(crbug.com/40189625): Remove this feature and clean up.

 When enabled, caches the stripped outgoing referrer URL on Document.

 When enabled allows the header name used in the blink
 CacheStorageCodeCacheHint runtime feature to be modified.  This runtime
 feature disables generating full code cache for responses stored in
 cache_storage during a service worker install event.  The runtime feature
 must be enabled via the blink runtime feature mechanism, however.

 Flushes canvas if the recording limit has been exceeded. This is a heuristic
 based on memory and GPU performance:
 - High memory usage causes discarded resources in low-end devices.
 - PaintOpBuffers that grow indefinitely. The OOPR-related jank is caused by
 long-running RasterCHROMIUM calls that monopolize the main thread
 of the GPU process. By flushing periodically, we allow the rasterization
 of canvas contents to be interleaved with other compositing and UI work.

 The default values for these parameters were initially determined
 empirically. They were selected to maximize the MotionMark score on
 desktop computers. Field trials may be used to tune these parameters
 further by using metrics data from the field.

 Temporarily disabled due to issues:
 - PDF blank previews
 - Canvas corruption on ARM64 macOS
 See https://g-issues.chromium.org/issues/328755781

 Defer canvas hibernation when visibility changed.

 Don't hibernate small canvas elements.

 When hibernating, make sure that the just-used transfer memory (to transfer
 the snapshot) is freed.

 Whether to capture the source location of JavaScript execution, which is one
 of the renderer eviction reasons for Back/Forward Cache.

 Controls whether mirroring negotiations will include the AV1 codec for video
 encoding.

 NOTE: currently only software AV1 encoding is supported.
 TODO(crbug.com/40246079): hardware AV1 encoding should be added.

 Controls whether the new exponential bitrate calculate logic is used, or
 the legacy linear algorithm.
 TODO(crbug.com/302584587): This is the V2 implementation of this experiment,
 following the failure of the initial experiment.

 Controls whether mirroring negotiations will include the VP8 codec for video
 encoding.

 NOTE: this is the default codec for Cast Streaming. Be careful when
 disabling.

 Controls whether mirroring negotiations will include the VP9 codec for video
 encoding.

 A video encoder is allowed to drop a frame in cast mirroring.

 CDM host verification is enabled by default. Can be disabled for testing.
 Has no effect if ENABLE_CDM_HOST_VERIFICATION buildflag is false.

 Elevates the CDM service process' priority to improve media playback
 performance.

 Elevates the CDM service process' main thread priority to improve media
 playback performance.

 Enables the experimental Rust implementation of ChildProcessSecurityPolicy.
 This includes managing global state but not per-process ProcessState (which
 is handled by the ChildProcessSecurityPolicyRustProcessState feature). See
 https://crbug.com/482216433.

 Controls whether the Rust implementation of ChildProcessSecurityPolicy
 manages per-process ProcessState. Only takes effect if
 ChildProcessSecurityPolicyRust is also enabled (for the global state). See
 https://crbug.com/522872468

 Clear the window.name property for the top-level cross-site navigations that
 swap BrowsingContextGroups(BrowsingInstances).

 Safety switch to allow us to revert to the previous behavior of using the
 cached bounds when the permission prompt is visible. If this feature is
 enabled (the default), we will clear the cached bounds, whenever the
 permission prompt is visible.

 Enable legacy device-memory client hint.

 Enable legacy dpr client hint.

 Enable legacy width client hint.

 Enable legacy viewport-width client hint.

 Killswitch for coarsening CurrentMediaTime() to prevent high-resolution
 timing attacks (crbug.com/562970433). Remove after M157 reaches stable.

 Disabling this will cause parkable strings to never be compressed.
 This is useful for headless mode + virtual time. Since virtual time advances
 quickly, strings may be parked too eagerly in that mode.

 Controls off-thread code cache consumption.

 Enables the constant streaming in the ContentCapture task.

 If enabled, content:// URLs are considered local, and won't be allowed
 to be downloaded.

 Enables the "Copy Video Frame" context menu item.

 Enables the "Save Video Frame As" context menu item.
 On Android, this is "Download Video Frame" context menu item.

 Enables the "Search Video Frame with <Search Provider>" context menu item.

 When enabled, add a new option, {imageOrientation: 'none'}, to
 createImageBitmap, which ignores the image orientation metadata of the source
 and renders the image as encoded.

 Allows loading Top Chrome Webium.

 When enabled, Declarative CSS Modules will generate a DataURI instead of a
 Blob URL in the generated Import Map.

 Runs the media service in the GPU process on a dedicated thread.

 When enabled, puts non-isolated sites in separate SiteInstances in a default
 SiteInstanceGroup (per BrowsingInstance), rather than sharing a default
 SiteInstance.

 Defer requesting persistent audio focus until the WebContents is audible.
 The goal is to prevent silent playback from taking audio focus from
 background apps on android, where focus is typically exclusive.

 Defer Session Storage scavenging to avoid LevelDB initialization blocking
 the critical path of startup.

 Enables deferring the creation of the speculative RFH when the navigation
 starts. The creation of a speculative RFH consumes about 2ms and is blocking
 the network request. With this feature the creation will be deferred until
 the browser initializes the network request. The speculative RFH will be
 created while the network service is sending the request in parallel.

 When enabled, HTMLTreeBuilder::Flush() will be throttled in kTextMode
 to reduce O(n^2) string copies.
 The first flush will always be allowed to complete immediately, then
 subsequent flushes will be throttled and will backoff exponentially up to a
 "max_interval". The "initial_interval" is the delay introduced after the
 first flush and is increased by "multiplier" for each subsequent flushes.
 See https://crbug.com/500385603 for more context and how the numbers were
 selected.

 When a device bound session
 (https://github.com/w3c/webappsec-dbsc/blob/main/README.md) is
 terminated, evict pages with cache-control:no-store from the
 BFCache. Note that if kCacheControlNoStoreEnterBackForwardCache is
 disabled, no such pages will be in the cache.

 Whether force-showing interest is enabled.

 Improves the signal-to-noise ratio of network error related messages in the
 DevTools Console.
 See http://crbug.com/124534.

 Controls whether the Digital Goods API is enabled.
 https://github.com/WICG/digital-goods/

 Enables the BTM (Bounce Tracking Mitigation) feature.
 On by default to allow for collecting metrics. All potentially dangerous
 behavior (database persistence, storage deletion) will be gated by params.

 Flag used to control the TTL for user interactions (separately from the
 |kBtm| feature flag).

 Controls whether the OpusAudioDecoder is used for Opus audio decoding
 (instead of the FFmpegAudioDecoder).

 When this feature is enabled, partial storage cleanup will be
 disabled for the GPU disk cache. (Performance improvement)

 When enabled, OOPIFs will not try to reuse compatible processes from
 unrelated tabs.

 Killswitch for disallowing mixing opaque and non-opaque responses in
 ResourceMultiBufferDataProvider (crbug.com/572363265).
 TODO(crbug.com/572363265): Remove after M158 reaches stable.

 A console warning is shown when the opaque url returned from Protected
 Audience/selectUrl is used to navigate an iframe. Since fenced frames are not
 going to be enforced for these APIs in the short-medium term, disabling this
 warning for now.

 Adds an animation to document picture-in-picture resizes.

 Allows document picture-in-picture pages to request capture.

 Allow document picture-in-picture to navigate.  This should be disabled
 except for testing.

 Enable drawing under System Bars within DisplayCutout.

 Enables the Email Verification Protocol (EVP).
 Note that actual exposure of the EVP API to web content is controlled by the
 flag in RuntimeEnabledFeatures on the blink side. See also the use of
 kSetOnlyIfOverridden in content/child/runtime_features.cc. We enable it here
 by default to support use in origin trials.

 Enables canvas 2d methods BeginLayer and EndLayer.

 Extends console.timestamp to support adding deep-links into the DevTools
 Performance Panel, which (when clicked) call into a DevTools extension.

 Controls whether the Mirroring Service will fetch, analyze, and store
 information on the quality of the session using RTCP logs.

 Enables user control over muting tab audio from the tab strip.

 Enables tracking the occlusion of HW secure encrypted video elements.
 The HW secure check is OS agnostic, but this switch is currently only
 enabled by default on Windows, and not used for other platforms.

 Enforce same-origin check for dedicated worker script URLs.
 See https://crbug.com/496253755.

 Prevents an opener from being returned when a BlobURL is cross-site to the
 window's top-level site.

 Killswitch for restrictions on blob URL creation in PDF processes, in case
 regressions are encountered in the wild. See https://crbug.com/540051167.

 Enforce same-origin check for shared worker script URLs.
 See https://crbug.com/504073872.

 Ensures the renderer is not dead when getting the process host for a site
 instance.

 When enabled, ads will not be eligible for origin-keyed processes by default.
 Ads can still opt into origin-keyed processes by using the
 Origin-Agent-Cluster: ?1 header.

 Enables extended video bitstream validation for H.264 and H.265.

 Enables support for External Clear Key (ECK) key system for testing on
 supported platforms. On platforms that do not support ECK, this feature has
 no effect.

 Fade in scrollbar at may-begin wheel event. This only works on macOS.

 Prevents UrlProvisionFetcher from making a provisioning request. If
 specified, any provisioning request made will not be sent to the provisioning
 server, and the response will indicate a failure to communicate with the
 provisioning server.

 Falls back to other decoders after audio/video decode error happens. The
 implementation may choose different strategies on when to fallback. See
 DecoderStream for details. When disabled, playback will fail immediately
 after a decode error happens. This can be useful in debugging and testing
 because the behavior is simpler and more predictable.

 FeatureManagement gate for Live Translate on ChromeOS devices. No impact
 outside of CrOS.

 Enables JavaScript API to intermediate federated identity requests.
 Note that actual exposure of the FedCM API to web content is controlled
 by the flag in RuntimeEnabledFeatures on the blink side. See also
 the use of kSetOnlyIfOverridden in content/child/runtime_features.cc.
 We enable it here by default to support use in origin trials.

 Enables Active Mode support with multiple Identity Providers in FedCM.

 Enables showing FedCM accounts for passive mode requests in an ambient
 bubble, instead of the regular FedCM dialog. This is separate from
 kFedCmAmbientUI, which shows FedCM in the omnibox.

 Enables the FedCM ambient UI.

 Enables RPs to enhance autofill with federated accounts fetched by the FedCM
 API.

 Enables usage of the FedCM Delegation API.

 Enables FedCM to support login request initiated by the embedder.

 Enables FedCM Identity Handler (Service Worker interception of FedCM
 requests). When enabled, IDPs can declare a Service Worker in their
 .well-known/web-identity file to intercept credentialed FedCM requests
 (accounts, id-assertion, disconnect).
 Explainer: https://github.com/w3c-fedid/identity-handler
 Spec: https://w3c-fedid.github.io/FedCM/
 Design doc:
 https://docs.google.com/document/d/1PgiLzfvE8NsSnxgJYA3WUEld0FguPfPETHDPjUb6wlo/
 Bug: 526074797

 Enables usage of the FedCM IdP Registration API.

 Enables Lightweight FedCM Mode

 Enables usage of the FedCM API with metrics endpoint at the same time.

 Enables browser to connect FedCM requests to Native Identity Providers.

 Enables usage of the FedCM IdP-Initiation API.

 Enables Nonce usage in Params

 Enables subdomain-first discovery for the FedCM well-known file. Fetches
 https://web-identity.well-known.<eTLD+1>/.well-known/web-identity first and
 falls back to the apex URL on failure (network error, malformed JSON, or
 provider_urls length > 1).

 Controls whether FedCM requires explicit endpoint declaration in well-known
 files when client_metadata is used. When enabled, accounts_endpoint and
 login_url must be present in .well-known/web-identity for privacy validation.

 Enables bypassing the well-known file enforcement.

 TODO(b/517926260): Remove this feature flag once the change has made it
 through a stable channel revision.
 See b/517926260.

 Enable the <fencedframe> element; see crbug.com/1123606. Note that enabling
 this feature does not automatically expose this element to the web, it only
 allows the element to be enabled by the runtime enabled feature, for origin
 trials.

 Temporarily un-disable credentials on fenced frame automatic beacons until
 third party cookie deprecation.
 TODO(crbug.com/1496395): Remove this after 3PCD.

 Enable sending event-level reports through reportEvent() in cross-origin
 subframes. This requires opt-in both from the cross-origin subframe that is
 sending the beacon as well as the document that contains information about
 the reportEvent() endpoints.

 Enables browser-side focus verification when crossing fenced boundaries.

 Controls functionality related to network revocation/local unpartitioned
 data access in fenced frames.

 Enables a bug fix that allows a 'src' allowlist in the |allow| parameter of a
 <fencedframe> or <iframe> loaded with a FencedFrameConfig to behave as
 expected. See: https://crbug.com/349080952

 Controls whether category-keyed UKM (FetchRequest.WithCategory) is logged
 when a fetch() request reaches a terminal state.

 Controls whether FFmpegDemuxer attaches the HDR metadata carried by ITU-T
 T.35 timed metadata tracks to the video tracks that reference them.

 When enabled, the field classification model uses runtime caching to not run
 models on the same inputs multiple times.
 TODO(crbug.com/371933424). Clean up when launched, if not used for Autofill
 experiments.

 Enforces a minimum top-level window size for file chooser dialogs to mitigate
 UI occlusion spoofing (see crbug.com/479258455).

 Blocks picture-in-picture windows while file dialogs are open.

 Tucks picture-in-picture windows while file dialogs are open.

 Forces software video encoders to be used for low resolutions.
 Enabled-by-default, except for Android where SW encoder for H26x and AV1 are
 (sometimes) not available.
 TODO: crbug.com/40068556 - Enable for Android and remove this flag.

 Whether a memory pressure signal in a renderer should be forwarded to Blink
 isolates. Forwarding the signal triggers a GC (critical) or starts
 incremental marking (moderate), see v8::Heap::CheckMemoryPressure.

 Enables the frequency capping for detecting overlay popups. Overlay-popups
 are the interstitials that pop up and block the main content of the page.

 When getDisplayMedia() is invoked, the user sees and interacts with
 a Chromium prompt through which they choose which tab/window/screen
 to share. If this flag is enabled, then when the user chooses to
 share, transient activation is conferred on the capturing Web application.

 TODO(crbug.com/420406085): Remove after January 2028.
 Keep this flag around at least until that date.

 The feature will be tested and rolled out independently on iOS.

 Auto-dismiss global media controls.

 Enables the "Save Video Frame" button in Global Media Controls.

 Enable selection of audio output device in Global Media Controls.

 Enable global VA-API lock. Disable this to use lock-free VA-API function
 calls for thread safe backends.

 Whether GuestViews (see components/guest_view/README.md) are implemented
 using MPArch inner pages. See https://crbug.com/40202416

 When enabled, H.264 keyframe detection becomes stricter for samples whose avc
 config does not provide SPS/PPS. In that case, an IDR alone is not
 sufficient, SPS+PPS must appear in-band to mark it as a keyframe.

 Skips H.264 NAL units with the unspecified nal_unit_type 31 during Annex B
 conversion, to work around platform decoders that fail on them.
 TODO(b/567236166): Remove once the cros-codecs fix has rolled out.

 When enabled, URLProvisionFetcher is hardened against SSRF and OOM by
 restricting requests and redirects to HTTPS POST, and enforcing a maximum
 response size.

 Enables handling of hardware media keys for controlling media.

 Enables hardware secure decryption if supported by hardware and CDM.
 NOTE: For Windows platform, hardware secure decryption is available via
 PlayReady SL3000.
 TODO(xhwang): Currently this is only used for development of new features.
 Apply this to Android and ChromeOS as well where hardware secure decryption
 is already available.

 Enables hardware secure AV1 decoding if supported by the hardware
 and the OS Content Decryption Module (CDM).

 Allows automatically disabling hardware secure Content Decryption Module
 (CDM) after failures or crashes to fallback to software secure CDMs. If this
 feature is disabled, the fallback will never happen and users could be stuck
 in playback failures.

 Enables hardware secure VP9 decoding if supported by the hardware
 and the OS Content Decryption Module (CDM).

 If enabled, Glic will start captioning as soon as a profile is loaded.

 Controls headless Live Caption experiment, which is likely unstable.

 Enables or disables the intervention that unloads ad iframes with intensive
 resource usage.

 Enables or disables sending the heavy ad report to the root ad frame's
 embedder.

 Enables or disables reporting on the intervention that unloads ad iframes
 with intensive resource usage.

 Enables or disables the privacy mitigations for the heavy ad intervention.
 This throttles the amount of interventions that can occur on a given host in
 a time period. It also adds noise to the thresholds used. This is separate
 from the intervention feature so it does not interfere with field trial
 activation, as this blocklist is created for every user, and noise is decided
 prior to seeing a heavy ad.

 This flag unconditionally enables the SQLite backing store. Used for
 about:flags.

 Controls whether we ignore duplicate navigations or not, in favor of
 preserving the already ongoing navigation.

 Enables rendering the top chrome in WebUI. This is a central flag to enable
 the WebUI implementation of top chrome. Individual features will be
 additionally gated by this flag.

 Gating the migration of Android IME cursor anchor updates from Mojo IPC to
 RenderFrameMetadata.

 Kill switch for the GetInstalledRelatedApps API.

 Allow Windows specific implementation for the GetInstalledRelatedApps API.

 When enabled, wake ups from throttleable TaskQueues are limited to 1 per
 minute in a page that has been backgrounded for 5 minutes.

 Intensive wake up throttling is enforced in addition to other throttling
 mechanisms:
  - 1 wake up per second in a background page or hidden cross-origin frame
  - 1% CPU time in a page that has been backgrounded for 10 seconds

 Feature tracking bug: https://crbug.com/1075553

 The base::Feature should not be read from; rather the provided accessors
 should be used, which also take into account the managed policy override of
 the feature.

 The base::Feature is enabled by default on all platforms. However, on
 Android, it has no effect because page freezing kicks in at the same time. It
 would have an effect if the grace period ("grace_period_seconds" param) was
 reduced.

 InterestFeedV2 takes precedence over InterestFeedContentSuggestions.
 InterestFeedV2 is cached in ChromeCachedFlags. If the default value here is
 changed, please update the cached one's default value in CachedFeatureFlags.

 Enables the internal Media Session logic without enabling the Media Session
 service.

 Sets IO threads to kInteractive all the time.

 Enable support for isolated web apps. This will guard features like serving
 isolated web apps via the isolated-app:// scheme, and other advanced isolated
 app functionality. See https://github.com/reillyeon/isolated-web-apps for a
 general overview.
 Please don't use this feature flag directly to guard the IWA code.  Use
 IsolatedWebAppsPolicy::AreIsolatedWebAppsEnabled() in the browser process or
 check kEnableIsolatedWebAppsInRenderer command line flag in the renderer
 process.

 Enables process isolation of fenced content (content inside fenced frames)
 from non-fenced content. See
 https://github.com/WICG/fenced-frame/blob/master/explainer/process_isolation.md
 for rationale and more details.

 Alternative to switches::kIsolateOrigins, for turning on origin isolation.
 List of origins to isolate has to be specified via
 kIsolateOriginsFieldTrialParamName.

 Allow process isolation of iframes with the 'sandbox' attribute set. Whether
 or not such an iframe will be isolated may depend on options specified with
 the attribute. Note: At present, only iframes with origin-restricted
 sandboxes are isolated.

 When enabled, forces the priority of isolates in hidden renderers to
 best-effort, overriding the effect of kIsolatesPriorityUseProcessPriority
 (isolates in visible renderer will still get their priority derived from
 process priority).

 When enabled, derives isolate priority from the more granular process
 priority (user-blocking, user-visible, best-effort) instead of renderer
 visibility (visible, hidden).

 Subtlety: A renderer hosting a hidden frame playing audio will have
 user-blocking priority. Without this feature, an isolate in this renderer
 would have best-effort priority (derived from the visibility), whereas with
 the feature it would be user-blocking. To keep isolates in hidden renderers
 at best-effort priority, but otherwise use the process priority, enable this
 feature along with "IsolatesPriorityBestEffortWhenHidden".

 Enables process isolation for subframe error pages. See
 https://crbug.com/40134629.
 TODO(crbug.com/40134629): Enable by default on Android as well.

 Enable the prototype global optimization of tuneables via finch.  See
 media/base/tuneable.h for how to create tuneable parameters.

 Kill-switch for the tracking of keep-alive requests blocked by client.

 If enabled, the body of EmulateLoadStartedForInspector is executed only
 once per Resource per ResourceFetcher, and thus duplicated network load
 entries in DevTools caused by EmulateLoadStartedForInspector are removed.
 https://crbug.com/1502591

 Use "style" and "json" destinations for CSS and JSON modules.
 https://crbug.com/1491336

 Logs a DumpWithoutCrashing() call each time the Speech On-Device API (SODA)
 fails to load. Used to diagnose issues when rolling out new versions of the
 SODA library.

 When enabled, creation of the BrowserInterfaceBroker on RenderFrameHostImpls
 becomes lazy. i.e. the BrowserInterfaceBroker is constructed only when it is
 needed, typically when a renderer process becomes associated with the frame.
 See https://crbug.com/450912216 for more details.

 Enables more conservative settings for ParkableString: suspend parking in
 foreground, and increase aging tick intervals.

 A feature to reduce the set of resources fetched by No-State Prefetch.

 Enables the Live Caption feature on supported devices.

 Enable automatic downloading of speech recognition language packs.

 Enable experimental Live Caption languages.

 Log the amount of flickering between partial results. This measures how often
 the system revises earlier outputs, to quantify the system's output
 instability or flicker. Intuitively, it measures how many tokens must be
 truncated from the previous text before appending any new text. The erasure
 of the current timestep can be calculated from its longest common prefix with
 the previous timestep.

 Enable or disable Live Caption from the right click menu.

 Enable speech recognition model LLM integration for Live Caption.

 Use a greedy text stabilizer to reduce flickering when translating partial
 speech recognition results.

 Use a wait-k approach to reduce flickering when translating partial speech
 recognition results.

 Enable or disable Live Caption support for WebAudio.

 If this is enabled, LoadingPredictor restricts the number of preconnects for
 the same destination to one.

 Makes network loading tasks unfreezable so that they can be processed while
 the page is frozen.

 When enabled, a HaTS survey is shown after the user visited "Contact info"
 settings page.

 When enabled, a HaTS survey is shown after the user visited "Identity docs"
 settings page.

 When enabled, a HaTS survey is shown after the user visited Password Manager
 management surface.

 When enabled, a HaTS survey is shown after the user visited "Payments"
 settings page.

 When enabled, a HaTS survey is shown after the user visited "Travel"
 settings page.

 When enabled, a HaTS survey is shown after the user visited "Your saved info"
 settings page.

 Allows Chrome to reconfigure the sink to match the channel count of the
 source audio data. This ensures opening of an audio output stream to match
 the source audio data channels, to signal to the downstream audio
 subsystem that the audio must be processed according to the source audio
 channel count.
 TODO(crbug.com/445215599): This should be replaced with a MediaClient
 mechanism if it works as intended.

 The MBI mode controls whether or not communication over the
 AgentSchedulingGroup is ordered with respect to the render-process-global
 legacy IPC channel, as well as the granularity of AgentSchedulingGroup
 creation. This will break ordering guarantees between different agent
 scheduling groups (ordering withing a group is still preserved).
 DO NOT USE! The feature is not yet fully implemented. See crbug.com/1111231.

 When enabled, MediaCapabilities will check with GPU Video Accelerator
 Factories to determine isPowerEfficient = true/false.

 Enable Media Capabilities with finch-parameters.

 The following Media Engagement flags are not enabled on mobile platforms:
 - MediaEngagementBypassAutoplayPolicies: enables the Media Engagement Index
   data to be esude to override autoplay policies. An origin with a high MEI
   will be allowed to autoplay.
 - PreloadMediaEngagementData: enables a list of origins to be considered as
   having a high MEI until there is enough local data to determine the user's
   preferred behaviour.

 Allows per-site special processing for media links.

 Enables sending MediaLog to the log stream, which is useful for easier
 development by ensuring logs can be seen without a remote desktop session.
 Only affects builds when DCHECK is on for non-ERROR logs (ERROR logs are
 always sent to the log stream). Enabled by default on Android and ChromeOS.

 Enable aggregate power measurement for media playback.

 If enabled, users can request Media Remoting without fullscreen-in-tab.

 If enabled, chrome would inform Glic once it starts transcribing, if Glic
 requested to be informed.

 Controls the configurablity of the navigation confidence noise level.
 If the feature is not enabled, then the epsilon value will be 1.1.

 When NavigationNetworkResponseQueue is enabled, the browser will schedule
 some tasks related to navigation network responses in a kHigh priority
 queue.

 Used to control the collection of anchor element metrics (crbug.com/856683).
 If kNavigationPredictor is enabled, then metrics of anchor elements
 in the first viewport after the page load and the metrics of the clicked
 anchor element will be extracted and recorded.
 Note that the desktop roll out is being done separately from android. See
 https://crbug.com/40258405

 Used to control the collection of new viewport related anchor element
 metrics. Metrics will not be recorded if either this or kNavigationPredictor
 is disabled.

 Puts network quality estimate related Web APIs in the holdback mode. When the
 holdback is enabled the related Web APIs return network quality estimate
 set by the experiment (regardless of the actual quality).

 If the network service is enabled, runs it in process.

 Feature which disables caching a previous selection menu object.

 Feature which holdbacks NoStatePrefetch on all surfaces.

 Enables the On-Device Web Speech feature on supported devices.

 Enables on-device speech recognition using on-device Gemini Nano.

 Kill switch for requiring sticky activation in SpeechRecognition.install()
 for relaxed model downloads. See https://crbug.com/559063678.

 Enables on-device speech recognition using on-device TinyGemma.

 Enables multi-language support for on-device speech recognition using
 on-device TinyGemma.

 When enabled, fast-exits the mixed-content checks for secure URLs.

 Improve ServiceWorkerAutoPreload coverage by using more accurate web request
 proxy detection.

 If enabled, ServiceWorkerAutoPreload will not start if any installed
 extension has the webRequest or declarativeNetRequest permission, or if
 the request is initiated by <webview>.

 If not enabled, ServiceWorkerAutoPreload will not start if any installed
 extension has the webRequest, declarativeNetRequest, or webview
 permission. On Desktop platforms, there are often default extensions with the
 webview permission, meaning ServiceWorkerAutoPreload is almost always not
 enabled.

 Controls the Origin-Agent-Cluster header. Tracking bug
 https://crbug.com/1042415; flag removal bug (for when this is fully launched)
 https://crbug.com/1148057.

 The name is "OriginIsolationHeader" because that was the old name when the
 feature was under development.

 Enables origin-keyed processes by default, unless origins opt out using
 Origin-Agent-Cluster: ?0. This feature only takes effect if the Blink feature
 OriginAgentClusterDefaultEnable is enabled, since origin-keyed processes
 require origin-agent-clusters.

 Only used for disabling overlay fullscreen (aka SurfaceView) in Clank.

 History navigation in response to horizontal overscroll (aka gesture-nav).

 Enable defer commits to avoid flash of unstyled content, for all navigations.

 Causes the AVC parser to additionally parse and indicate when an SEI
 recovery point with recovery_frame_cnt=0 has been found.

 Enables the use of the PaintCache for Path2D objects that are rasterized
 out of process.  Has no effect when kCanvasOopRasterization is disabled.

 Whether web apps can run periodic tasks upon network connectivity.

 Adds a mute/unmute button to the Video Picture-in-Picture overlay window.

 Enables tracking the position of picture-in-picture windows to know when they
 occlude certain widgets.

 Allows usage of OS-level (platform) audio encoders.

 If enabled, PreconnectManager bypasses UI-thread host preresolve and connects
 sockets directly to the network context for single preconnect requests.

 Enables the preemptive downloading of the SODA binary and language
 packs.

 Whether we should composite a PLSA (paint layer scrollable area) even if it
 means losing lcd text.

 If enabled, activation beacon is sent when a prefetched page is activated.
 The activation beacon is a beacon that echoes back a server specified token
 to the server when a prefetched page is activated.

 Controls the behavior of a prefetch ahead of an imminent navigation, i.e. a
 prefetch triggered by a signal that the navigation is (almost) certain to
 happen soon. See PrefetchRequest::is_ahead_of_imminent_navigation().

 Allow starting prefetch request from off the main thread. Please see
 crbug.com/452389538 for more details.

 Use code paths for prefetch/prerender integration.
 See also kPrerender2FallbackPrefetchSpecRules.

 If explicitly disabled, prefetch proxy is not used.

 Make PrefetchRequestStatusListener notifications async.
 https://crbug.com/496807663

 This feature was used to launch the prefetch migration from embedder layer to
 content/, and this work has finished and the old implementation was deleted.
 Now this flag is just for injecting parameters through field trials as an
 umbrella feature.

 Launch mouse hover feature only on Desktop. Note that Android Desktop mode is
 currently out of scope.

 Killswitch for UA override issue fix (crbug.com/441612842) in preloading.

 Triggers prefetch ahead of prerender for Speculation Rules.
 See https://crbug.com/342089123 for more details.

 Enabled except for Android WebView.

 If enabled, the feature allows the prerender host to be reused for the
 future same-site page prerender if marked as reusable.

 If enabled, activation beacon is sent when a prerendered page is activated.
 The activation beacon is a beacon that echoes back a server specified token
 to the server when a prerendered page is activated.

 If enabled, the feature allows user to see a preview of their handwriting
 gestures (Select and Delete gestures).

 When PrioritizeMainFrameNavigationNetworkResponse is enabled, the browser
 will schedule tasks related to primary main frame navigation network
 responses in a kHighest priority queue.

 Enables exposure of ads APIs in the renderer: Attribution Reporting,
 FLEDGE, Topics, along with a number of other features actively in development
 within these APIs.

 Reuses RenderProcessHost up to a certain threshold. This mode ignores the
 soft process limit and behaves just like a process-per-site policy for all
 sites, with an additional restriction that a process may only be reused while
 the number of main frames in that process stays below a threshold.

 When enabled, ProcessSelectionDeferringConditions will be run. This allows
 the embedder to provide conditions that may delay the final process selection
 until the conditions have their results.

 Fires the pushsubscriptionchange event defined here:
 https://w3c.github.io/push-api/#the-pushsubscriptionchange-event
 for subscription refreshes, revoked permissions or subscription losses

 Fires the pushsubscriptionchange event defined here:
 https://w3c.github.io/push-api/#the-pushsubscriptionchange-event
 upon manual resubscription to previously unsubscribed notifications.

 Enables Media Engagement Index recording. This data will be used to determine
 when to bypass autoplay policies. This is recorded on all platforms.

 Enables Media Engagement Index recording for Web Audio playbacks.

 Reduce the amount of information in the default 'referer' header for
 cross-origin requests.

 When enabled, sends SubresourceResponseStarted IPC only when the user has
 allowed any HTTPS-related warning exceptions. From field data, ~100% of
 subresource notifications are not required, since allowing certificate
 exceptions by users is a rare event. Hence, if user has never allowed any
 certificate or HTTP exceptions, notifications are not sent to the browser.
 Once we start sending these messages, we keep sending them until all
 exceptions are revoked and browser restart occurs.

 When disabled, cropTo() is rejected while other tracks share the source, as
 it was before per-track cropping was supported.

 Whether blink::Resource deletes its decoded data on memory pressure.

 Whether blink::MemoryCache and blink::ResourceFetcher release their
 strong references to resources on memory pressure.

 Flag guard for removing usage of the CommitNavigationParams.redirects
 array of URLs in the renderer process.

 Enable using the RenderDocument.

 Controls whether muted media stream audio should continue to render.

 If enabled, the AuthenticatorSelectionDialogBridge will reset the native
 pointer when the dialog is dismissed.

 Enables a platform-specific resolution cutoff for prioritizing platform
 decoders over software decoders or vice-versa.

 Note: This feature is used by ChromeOS tests and shouldn't be removed even
 though it has long been enabled by default.

 Master flag for the Resource Broker metrics-only skeleton, which observes
 eligible subresource responses to measure cross-renderer duplication of
 identical bytes. No serving behavior exists behind this flag.

 Policy: serving requires a future separate default-off feature; a
 configuration that appears to request serving degrades to metrics-only with
 a warning + UMA, never a browser-process CHECK.

 Tracking bug: crbug.com/560232768

 Restrict the maximum number of concurrent ThreadPool tasks when a renderer is
 low priority.

 Let videos be resumed via remote controls (for example, the notification)
 when in background.

 Allows same-document available-image reuse for no-store images.

 Approach original pre-REC MSE object URL autorevoking behavior, though await
 actual attempt to use the object URL for attachment to perform revocation.
 This will hopefully reduce runtime memory bloat for pages that do not
 explicitly detach their HTMLME+MSE object collections nor explicitly revoke
 the object URLs used to attach HTMLME+MSE. When disabled, revocation only
 occurs when application explicitly revokes the object URL, or upon the
 execution context teardown for the MediaSource object. When enabled,
 revocation occurs upon successful start of attachment of HTMLME to the object
 URL. Note, rather than immediately scheduling a task to revoke upon the URL's
 creation, as at least one other browser does and the original File API
 pattern used to follow, this delay until attachment start enables new
 scenarios that could use the object URL for attaching HTMLME+MSE cross-thread
 (MSE-in-workers), where there could be significant delay between the worker
 thread creation of the object URL and the main thread usage of the object URL
 for starting attachment to HTMLME.

 Run video capture service in the Browser process as opposed to a dedicated
 utility process.

 https://html.spec.whatwg.org/multipage/system-state.html#safelisted-scheme

 Enables unused site permission module in Safety Check.

 Update scheduler settings using resourced on ChromeOS.

 Controls script streaming for http and https scripts.

 Enables script streaming for non-http scripts.

 Enables sending Sec-Purpose: "prefetch" header for
 NoStatePrefetchURLLoaderThrottle.

 Enables sending Sec-Purpose: "prefetch" header for rel="prefetch".

 Browser-side feature flag for Secure Payment Confirmation (SPC) that also
 controls the render side feature state. SPC is not currently available on
 Linux or ChromeOS, as it requires platform authenticator support.

 Used to control whether to remove the restriction that PaymentCredential in
 WebAuthn and secure payment confirmation method in PaymentRequest API must
 use a user verifying platform authenticator. When enabled, this allows using
 such devices as UbiKey on Linux, which can make development easier.

 When enabled, the SubresourceFilter receives calls from the ResourceLoader
 to perform additional checks against any aliases found from DNS CNAME records
 for the requested URL.

 Enables auto preloading for fetch requests before invoking the fetch handler
 in ServiceWorker. The fetch request inside the fetch handler is resolved with
 this preload response. If the fetch handler result is fallback, uses this
 preload request as a fallback network request.

 Unlike navigation preload, this preloading is applied to subresources. Also,
 it doesn't require a developer opt-in.

 crbug.com/1472634 for more details.

 If enabled, UI thread tasks can check ServiceWorker registration information
 from the thread pool without waiting for running the receiving task. Please
 see crbug.com/421530699 for more details.

 (crbug.com/539155958): When enabled, ServiceWorkerDatabase treats missing
 next available ID metadata as database corruption if registrations exist on
 disk, triggering database doom and clean recovery.

 crbug.com/40410035: When enabled, download requests ("Save link as",
 "Save image as", <a download>) are intercepted by service workers, allowing
 the service worker's fetch event handler to provide a response.

 Service worker based payment apps as defined by w3c here:
 https://w3c.github.io/webpayments-payment-apps-api/
 TODO(rouslan): Remove this.

 Enables fallback to network request when the RaceNetworkRequest Mojo pipe is
 disconnected.

 (crbug.com/352578800): Enables building a sysnthetic response by
 ServiceWorker. For navigation requests, the pre-learned static response
 header is returned in parallel with dispatching the network request.

 If enabled, calling setInterval(..., 0) will not clamp to 1ms.
 Tracking bug: https://crbug.com/402694.

 http://tc39.github.io/ecmascript_sharedmem/shmem.html
 This feature is also enabled independently of this flag for cross-origin
 isolated renderers.

 If enabled, an entry point to AtMemory will be shown at the bottom of the
 Autocomplete dialogs.

 When enabled, puts subframe data: URLs in a separate SiteInstance in the same
 SiteInstanceGroup as the initiator.

 Controls whether to isolate sites of documents that specify an eligible
 Cross-Origin-Opener-Policy header.  Note that this is only intended to be
 used on Android, which does not use strict site isolation. See
 https://crbug.com/1018656.

 When enabled, the IPC channel will not be paused when launching non-guest
 renderer processes. This makes it possible for all kinds of mojo calls
 to be sent to the renderer process before OnProcessLaunched fires. When the
 feature is disabled, those messages are instead queued because the IPC
 channel is paused, and only flushed at OnProcessLaunched.

 Asks the Speech On-Device API (SODA) to run its TFLite models through the
 XNNPACK delegate. Older SODA binaries ignore the request.

 Controls whether SpareRenderProcessHostManager tries to always have a warm
 spare renderer process around for the most recently requested BrowserContext.
 This feature is only consulted in site-per-process mode.

 When enabled, sends the spare renderer information when setting the
 priority of renderers. Currently only Android handles the spare renderer
 information in priority.
 The target priority of a spare renderer in Android is decided by the feature
 parameters in ContentFeatureList.java.

 Enable the Speaker Change Detection feature, which inserts a line break when
 the Speech On-Device API (SODA) detects a speaker change.

 CanPlayThrough issued according to standard.

 Enable service worker warming-up feature. (https://crbug.com/1431792)

 Freeze scheduler task queues in background after allowed grace time.
 "stop" is a legacy name.

 Reduces the work done during renderer initialization.

 Controls whether site isolation should use origins instead of scheme and
 eTLD+1.

 Enables overriding the default subframe process shutdown delay via the
 "delay_seconds" field trial parameter. This allows for experimentation with
 different timeout values for keeping subframe processes alive for potential
 reuse.

 When enabled, "Manage information" menu item for enhanced autofill will
 redirect user either to "/travel" or "/identityDocs" pages instead of
 "/yourSavedInfo" always.

 Disallows window.{alert, prompt, confirm} if triggered inside a subframe that
 is not same origin with the main frame.

 Dispatch touch events to "SyntheticGestureController" for events from
 Devtool Protocol Input.dispatchTouchEvent to simulate touch events close to
 real OS events.

 Enables throttling of the active (visible) page's throttleable task queues
 (JS timers) to 1 Hz while it contains an effectively-fullscreen video, to
 reduce CPU/power usage during fullscreen video playback.

 Enable throttling of fetch() requests from service workers in the
 installing state.  The limit of 3 was chosen to match the limit
 in background main frames.  In addition, trials showed that this
 did not cause excessive timeouts and resulted in a net improvement
 in successful install rate on some platforms.

 Throttles Javascript timer wake ups of unimportant frames (cross origin
 frames with small proportion of the page's visible area and no user
 activation) on foreground pages.

 This feature allows touch dragging and a context menu to occur
 simultaneously, with the assumption that the menu is non-modal.  Without this
 feature, a long-press touch gesture can start either a drag or a context-menu
 in Blink, not both (more precisely, a context menu is shown only if a drag
 cannot be started).

 Controls whether the browser should track and reuse free and empty renderer
 processes. When enabled, the browser maintains a list of renderer processes
 that are currently not hosting any frames and are thus eligible for reuse
 when a new renderer process is needed. Currently, only background renderer
 processes are considered for reuse.

 Changes behavior of User-Agent Client Hints to send blank headers when the
 User-Agent string is overridden, instead of disabling the headers altogether.

 Enable the 'unframed' display override for IWAs. go/unframed-explainer-doc.

 Enables the Unified Autoplay policy by overriding the platform's default
 autoplay policy.

 If enabled, the usage of unload handlers causes a blocklisted reason for
 BFCache. The purpose is to capture their source location.

 This feature is for a reverse Origin Trial, enabling SharedArrayBuffer for
 sites as they migrate towards requiring cross-origin isolation for these
 features.
 TODO(bbudge): Remove when the deprecation is complete.
 https://developer.chrome.com/origintrials/#/view_trial/303992974847508481
 https://crbug.com/1144104

 When BeginMainFrame() is throttled, whether input-related BeginMainFrame()s
 are marked urgent, and thus unthtrottled.

 Enabled on Android, since a field trial showed benefits.

 If enabled, URLPattern will use standard defined dummy URL canonicalization
 to canonicalize URL properties. See https://crbug.com/409350827

 Use AndroidOverlay only if required for secure video playback. This requires
 that |kOverlayFullscreenVideo| is true, else it is ignored.

 Use PersistentCache on either side of blink.mojom.CodeCacheHost. This feature
 is dependent on net::HttpCache::IsSplitCacheEnabled() being true. Always use
 IsPersistentCacheForCodeCacheEnabled() rather than querying this feature
 directly.

 If enabled, GetUserMedia API will only work when the concerned tab is in
 focus

 Enable deriving sandboxed frame origins from browser-generated tokens
 instead of renderer-calculated opaque origins.

 Use SequencedTaskRunner for MediaService.

 When enabled, the address add/edit editor in the payments request would be
 removed and instead, the address editor from the settings will be used.
 TODO: crbug.com/399071964 - Remove when launched.

 When enabled, determines whether a VideoFrame requires copying before display
 based on whether the SharedImage usage includes
 SHARED_IMAGE_USAGE_DISPLAY_READ, rather than using
 VideoFrameMetadata::copy_required.

 Feature flag to run the MojoAudioDecoderService in a sequence different than
 the other mojo media services. On some Android devices, MediaCodec may block
 the thread which leads to frequent audio decoder underrun in renderer.
 Running the audio decoder in a separate sequence can improve the performance.
 Note: running audio decoder in a separate thread/sequence will cause
 multithread access to mojo media services. For Android audio decoder, the
 thread safety is easier to guarantee because:
   1. The audio decoder and most of the other mojo media services don't cross
   reference each other.
   2. The only exception is CDM so we use a lock inside MojoCdmServiceContext
   for thread safety.

 Safety switch to allow us to revert to the previous behavior of using the
 restored bounds for PiP windows, rather than the window bounds.  If this
 feature is enabled (the default), then we'll use the window bounds.

 Use the zstd compression algorithm for ParkableString compression.

 Enables future V8 VM features

 Ensures that the VAAPI context has been created before performing encrypted
 slice header parsing on ChromeOS VAAPI systems.
 TODO(b/520117896): remove the feature when a workaround can be found in the
 H264VaapiDecoderDelegate.

 Enable VA-API hardware low power encoder for all codecs on intel Gen9x gpu.

 NVIDIA VA-API drivers do not support Chromium and can sometimes cause
 crashes, disable VA-API on NVIDIA GPUs by default. See crbug.com/1492880.
 NVIDIA has been considering possibly supporting for an improved driver for
 hardware acceleration for ARM64 linux devices, so we have separated out the
 feature flag on that architecture.

 Ensure the advertised minimum supported resolution is larger than or equal to
 a given one (likely QVGA + 1) for certain codecs/modes and platforms, for
 performance reasons. This does not affect JPEG decoding.

 NOTE: This feature is default-enabled, but selectively disabled by tests
 so they can test resolutions below the threshold.  See crbug.com/40650027

 Enables a CHECK in NavigationRequest::ValidateCommitOrigin() to verify
 that the origin used at commit time matches the expected origin stored
 in the FrameNavigationEntry, whenever PageState is non-empty.

 This helps catch session history corruption or stale origin-related state
 being sent to the renderer, which could violate origin isolation and lead
 to security issues (see crbug.com/41492620).

 This feature is disabled by default while we diagnose on Canary only.

 Validates that the EncryptionPattern parameters are within the bounds
 specified by ISO/IEC 23001-7:2016.

 Enables comparing browser and renderer's DidCommitProvisionalLoadParams in
 RenderFrameHostImpl::VerifyThatBrowserAndRendererCalculatedDidCommitParamsMatch.

 Inform video blitter of video color space.

 Controls whether to pre-dispatch more decode tasks when pending decodes is
 smaller than maximum supported decodes as advertiszed by decoder.
 Note: This is controlled on a per-board basis by ChromeOS and must be kept.

 Enables video Picture-in-Picture display smoothness optimization.

 Ensures that the video PiP window title view is properly sized to only fit
 the favicon and origin.

 Forces video Picture-in-Picture windows to be treated as trusted for media
 playback. Used for debugging.

 Server-side kill switch for applying the local VisualViewport transform
 (page scale + visual viewport location) when mapping visual rects into
 viewport space in LayoutView's slow path (ancestor == nullptr). This keeps
 results consistent with the GeometryMapper viewport fast path.

 Controls scope extensions feature in web apps. Enables parsing of "site"
 entries in "scope_extensions" field in web app manifests. See explainer for
 more information:
 https://github.com/WICG/manifest-incubations/blob/gh-pages/scope_extensions-explainer.md

 This controls whether scope extensions work for isolated web apps which
 use same concepts as pwa
 https://github.com/WICG/manifest-incubations/blob/gh-pages/scope_extensions-explainer.md
 Note that for Isolated Web Apps it is not possible to capture link
 navigations without scope extensions.

 Controls parsing of the "lock_screen" dictionary field and its "start_url"
 entry in web app manifests.  See explainer for more information:
 https://github.com/WICG/lock-screen/
 Note: the lock screen API and OS integration is separately controlled by
 the content feature kWebLockScreenApi.

 Enable WebAssembly baseline compilation (Liftoff).

 Enables WebAssembly Shared-Everything Threads.

 Enable WebAssembly lazy compilation (JIT on first call).

 Enable WebAssembly Core stack switching.
 https://github.com/WebAssembly/stack-switching

 Enable WebAssembly tiering (Liftoff -> TurboFan).

 Enable WebAssembly trap handler.

 Controls whether WebAudio AudioContext has audibility hysteresis.

 Use deferred pull status update instead of updating the status directly
 on audio thread. See https://crbug.com/40249972.

 Controls whether the Web Bluetooth API is enabled:
 https://webbluetoothcg.github.io/web-bluetooth/

 Controls whether Web Bluetooth should use the new permissions backend. The
 new permissions backend uses ObjectPermissionContextBase, which is used by
 other device APIs, such as WebUSB. When enabled,
 WebBluetoothWatchAdvertisements and WebBluetoothGetDevices blink features are
 also enabled.

 A video encoder is allowed to drop a frame in WebCodecs.

 Enables a discard operation on WebContents to free associated resources.
 Eliminates the need to destroy the WebContents object to free its resources.

 Automatically convert light-themed pages to use a Blink-generated dark theme

 The feature is disabled on Android for WebView API issue discussed at
 https://crbug.com/942440.

 Enables the Digital Credential API.

 Enables the Digital Credentials Creation API.

 Enable the web lockscreen API implementation
 (https://github.com/WICG/lock-screen) in Chrome.

 This is intended as a kill switch for the WebOTP Service feature. To enable
 this feature, the experimental web platform features flag should be set.

 Controls which backend is used to retrieve OTP on Android. When disabled
 we use User Consent API.

 The JavaScript API for payments on the web.

 Enables HW decode acceleration for WebRTC.

 Enables HW encode acceleration for WebRTC.

 Kill switch for crbug.com/407785197.

 Inform webrtc with correct video color space information whenever
 possible.

 A hardware video encoder is allowed to drop a frame in WebRTC.

 Causes WebRTC to replace host ICE candidate IP addresses with generated
 names ending in ".local" and resolve them using mDNS.
 http://crbug.com/878465

 Causes WebRTC to not set the color space of video frames on the receive side
 in case it's unspecified. Otherwise we will guess that the color space is
 BT709. http://crbug.com/1129243

 On macOS, configures WebRTC's hardware video encoder (RTCVideoEncoder) to
 request native GPU input and pass SharedImage-backed VideoFrames without CPU
 readback. Depends on media::kVTVideoEncodeAcceleratorOpaqueSharedImageEncode
 (and media::kVTVideoEncodeAcceleratorOpaqueRgbSharedImageEncode for RGB
 canvas/WebGL/WebGPU frames) on the VideoToolbox encoder side.

 Used to set a few tunable parameters for the WebRTC Media Capabilities
 implementation.

 TODO(crbug.com/501209160): Remove this kill switch after confirming the
 standards-compliant behavior does not cause regressions.

 Instructs WebRTC to honor the Min/Max Video Encode Accelerator dimensions.

 Enables build-time generated resource-bundled code caches for WebUI pages.
 See crbug.com/375509504 for details.

 Enables code caching for scripts used on WebUI pages.

 If enabled, opted-in WebUIs will optimize resources loading by piping a
 dictionary of URL paths to materialized WebUI resource content to the
 renderer via LocalResourceLoaderConfig.
 For now, only TopChrome WebUI renderer-related WebUIs are opted-in, including
 NavigationControl and Omnibox Popup.
 This is an extension of kWebUIInProcessResourceLoading which previously
 serves only resources in resource bundle.
 See crbug.com/459528908.

 Reports WebUI Javascript errors to the crash server on all desktop platforms.
 Previously, this was only supported on ChromeOS and Linux.
 Intentionally enabled by default and will be used as a kill switch in case
 of regressions.

 Controls whether the WebUSB API is enabled:
 https://wicg.github.io/webusb

 Kill switch for https://crbug.com/338955051.

 Restricts the sharing of USBDevice instances across different V8
 worlds (e.g., main world and isolated worlds) to prevent cross-world
 leaks.

 Enables small accelerated canvases for webview (crbug.com/1004304)

 Trial to disable synchronous draw for synchronous compositor (ie Android
 WebView).

 Apply PrefetchPriority::kHighest for Webview Prefetch API.

 Controls whether the WebXR Device API is enabled.

 Controls the persistent license support for protected media that uses
 widevine.

 WorkerThread termination respects the current thread termination request.

 Indicates that renderer is running on an Android XR (AR/VR) device.
 Enables certain features which are not needed on other platforms.

 Gated behind feature flag to allow safe rollback of zero-copy capture.

 This flag changes about:blank to dark in dark mode on user action.

 crbug.com/409809747

 If the author did not define aria-actions, surface button and link
 children inside option and menuitem elements as implicit actions.

 Use a minimum role of group on elements that are keyboard-focusable.
 See https://w3c.github.io/html-aam/#minimum-role.

 Enforce no accessible name on objects that have a role where names are
 prohibited (listed in https://w3c.github.io/aria/#namefromprohibited):
 log a friendly error in the developer console, and trigger a DCHECK().
 The incorrect markup situation will be repaired, and the name will
 be exposed as a description instead.
 TODO(crbug.com/350528330,
 https://github.com/web-platform-tests/interop-accessibility/issues/133,
 https://github.com/w3c/accname/issues/240,
 https://github.com/w3c/accname/issues/241): If community feedback is
 positive, and WPT + accname testable statements are updated to allow
 this, then add status: test.

 https://chromestatus.com/feature/5113389252739072
 https://issues.chromium.org/issues/41119923

 Interest Group JS API/runtimeflag.

 Adjust the end of the next paragraph if the end position for the
 paragraph is updated while moving the paragraph. See
 https://crbug.com/329121649

 Strip actionability from content that is positioned offscreen
 via position:fixed and cannot be reached by scrolling.

 Strip actionability from content that is positioned offscreen via
 absolute/relative/static positioning and cannot be reached by scrolling.

 Whether to automatically build an APC content_extraction tree on load.

 Whether to enforce geometry invariants in AIPageContentAgent.
 Only supported for DCHECK-enabled builds.

 Ensures that text content extracted from DOM nodes are valid UTF-8 Before
 providing them to consumers of AIPageContent.

 When enabled, redact elements with --webkit-text-security.

 Add label sources in actionable APC.

 Remove labels that duplicate extracted text in any node in its subtree
 or its image caption. Remove SVG root text when extracted child nodes
 already contain it.

 Match labels to whole words or phrases in extracted text in any node in
 its subtree or its image caption, ignoring case. For example:
 - "Password" matches "Enter your password".
 - "lock" does not match "unlock".
 Exact matching still occurs when this is disabled, provided
 AIPageContentLabelRemoveRedundant is enabled.

 Use MapToVisualRectInAncestorSpace for outer bounding boxes, for
 math consistent with visual bounding boxes.

 Let fixed wrappers with pointer-events: none use normal APC container
 skipping instead of preserving them automatically.

 When enabled, iframe element coordinates will be tracked using the
 Element::SetTrackedElementSubRect() method.

 When enabled, native or heuristics password element coordinates will be
 tracked using the Element::SetTrackedElementSubRect() method.

 Clamp AIPageContent visible bounding boxes to the local-root viewport
 after visual-viewport mapping to normalize viewport-relative geometry.

 Gates access to legacy aliases of renamed "AIPromptAPI" identifiers.
 TODO(crbug.com/498228550): Remove after extension context usage drops.

 Gates access to legacy sampling parameter surfaces for "AIPromptAPI".
 Enabled in extension contexts.

 Gates access to inference parameter enhancements for "AIPromptAPI".
 This feature alone does not expose any "AIPromptAPI" feature access.

 Gates access to the responseConstraint enhancement for "AIPromptAPI".
 This feature alone does not expose any "AIPromptAPI" feature access.

 Gates access to the tool use (function calling) enhancement for
 "AIPromptAPI". This feature alone does not expose any "AIPromptAPI"
 feature access.

 Instead of creating a new DOMStringList on every access to
 location.ancestorOrigins, return the ancestor origins list
 stored on Document.
 This was added in M147 and can be removed after M149.
 https://issues.chromium.org/issues/483610021

 Kill switch for https://crbug.com/415834974 which changes anchor
 positioning adjustments to occur even in cases where there is no
 scrollable overflow.

 https://chromestatus.com/feature/6046278267043840

 https://chromestatus.com/feature/5083257285378048

 https://issues.chromium.org/issues/546237331

 https://drafts.csswg.org/web-animations-2/#triggers

 crbug.com/538260158

 crbug.com/445727139

 appearance:base for in-page form controls.
 https://drafts.csswg.org/css-forms-1/
 https://issues.chromium.org/issues/450139531
 https://chromestatus.com/feature/5104958101913600

 Restricts the display adjustment in LayoutTheme::AdjustStyle() to
 elements which have a native widget appearance, so that appearance
 no longer changes display on other elements.
 See https://crbug.com/568576344 and https://crbug.com/408002786.

 Gates the returned accuracyMode parameter upon permissions.query({name: "geolocation"})

 Gates the new permission "geolocation-approximate".

 The transition to "running" after construction happens asynchronously.
 Same for the transition to "suspended" after suspend() is called.
 https://webaudio.github.io/web-audio-api/#AudioContext-constructors

 AudioContext.playbackStats interface.

 Shared MessagePort between AudioWorklet and AudioWorkletGlobalScope.
 https://chromestatus.com/feature/5079784523694080

 https://drafts.csswg.org/css-scroll-snap

 When enabled, the dark mode filter (Auto Dark / force-dark) skips
 applying dark mode to images entirely; all images are kept untouched
 as if they are in light mode.
 P.N. AutoDarkMode needs to be applied separately.

 Pins a generic font-family on the autofill preview pseudo-elements so
 an author @font-face cannot oracle the previewed text.
 crbug.com/517710554.

 Makes form control elements have a hard coded font when they are in
 their autofill previewed state.

 Killswitch M156.

 Don't use a position inside non-selectable content as a selection
 boundary when it has no canonical position, which collapses the whole
 selection. See https://crbug.com/553831659.

 Disables the synchronous focus blur behavior when a focused form control
 is disabled.

 When enabled, enforces new interoperable semantics for 3D transforms.
 See crbug.com/1008483.

 A developer opt-out for background page freezing.

 Removes special layout code from customizable select which was
 preventing it from growing in the inline direction.

 closest-corner/farthest-corner in circle()/ellipse().
 crbug.com/361617757

 Visual caret movement in bidirectional text. When enabled, arrow
 keys move the caret in the visual (screen) direction rather than
 the logical (DOM/memory) order.
 Requires BidiCaretAffinity to be enabled for correct caret
 rendering at bidi boundaries.

 Whether MapToVisualRectInAncestorSpace() with a null ancestor can
 use the geometry mapper fast path.

 https://chromestatus.com/feature/4830298126417920

 Prevents the popup document for the select element from being opened
 if the corresponding OS window is not focused. Enabled in M147, can be
 removed in M150.

 https://crbug.com/415304289: Mouse and Pointer boundary event dispatch
 (i.e. dispatch of enter, leave, over, out events) tracks DOM node removal
 to fix event pairing on ancestor nodes.

 Bypasses the enforcement of the Page Embedded Permission Control
 security checks. This flag is disabled by default and should only be
 enabled in automated tests in order to allow them to avoid needing to
 wait until the PEPC is validated and also to use JS-initiated clicks.

 Enables RFC 7234-compliant Cache-Control header parsing, removing RFC
 2616 separators that are not valid in RFC 7234.
 https://crbug.com/42050325

 Enables metrics collection comparing RFC 7234 vs RFC 2616 Cache-Control
 parsing. Performs double parsing on every Cache-Control header to
 measure behavioral differences. Can be disabled as a kill switch if
 performance issues arise.
 https://crbug.com/42050325

 For emergency flag flips in case we discover bad bugs.

 Enables the <camera> and <microphone> HTML elements, allowing sites to
 embed camera and microphone permission request controls directly in the page.
 https://chromestatus.com/feature/5153829504024576

 When enabled, avoids eagerly flushing raster draw ops in FinalizeFrame
 for composited 2D canvases, deferring the flush to
 PrepareTransferableResource.

 https://github.com/WICG/html-in-canvas/blob/main/README.md
 Note the API name has changed to drawElementImage.

 Canvas2D API for specifying HDR headroom for drawing operations.
 https:/crbug.com/428575083, https://github.com/whatwg/html/issues/11165

 https://crbug.com/394052224

 Kill switch for https://crbug.com/385194416. Makes the canvas 2D
 context's direction getter reflect the stored keyword (including
 "inherit") instead of always resolving it to "ltr"/"rtl".

 https://crbug.com/479240778

 Canvas2D API for specifying HDR tone mapping behavior.
 https:/crbug.com/448552449, https://github.com/whatwg/html/issues/11424

 Kill switch for https://crbug.com/330506337.

 Enables capability delegation for the Digital Credentials API (both
 create and get requests).
 https://crbug.com/512747131

 Enables icon-only mode for capability elements.
 https://issues.chromium.org/issues/514564817

 Considers the full previous code point (not one UTF-16 code unit) for
 text-transform: capitalize word boundaries. Kill switch for
 crbug.com/501115609.

 TODO(crbug.com/1444712): Before enabling that flag by default,
 make sure MouseCursorOverlayController does not transmit mouse
 events to a CaptureController that don't have any
 capturedmousechange listener attached to it.
 See https://github.com/screen-share/mouse-events/issues/14

 Allows automated test runners to keep focused carets visible.

 Updates the sequential focus navigation starting point when moving the
 caret with the keyboard during caret browsing.
 https://crbug.com/567653181

 Keeps the caret outside an editable atomic inline - e.g.
 <div contenteditable style="display:inline-block"> - for a click that
 landed next to the box rather than on it.
 https://crbug.com/40780191

 Kill switch for changes to RenderFrameMetadataObserverImpl in connection with Engagement
 Signals. See https://crrev.com/c/4544201 and https://crbug.com/1458640.

 Compression Dictionary Transport: Align handling of crossorigin
 attribute on the spec.

 Compression Dictionary Transport: Use "compression-dictionary" as the
 destination string.

 Compression Dictionary Transport: Align handling of referrerpolicy
 attribute and referrer on the spec.

 Run the CSP "Should element's inline behavior be blocked?" check when
 an event handler content attribute is set to an inline script.
 See the specs:
 https://html.spec.whatwg.org/multipage/webappapis.html#event-handler-content-attributes
 https://w3c.github.io/webappsec-csp/#should-block-inline

 crbug.com/517429018

 This is a kill switch for a refactor of the way activation
 behaviors are triggered. It should not affect behavior.
 This flag shipped in M157 and can be removed in M160.

 Set currentTarget to null after dispatch for EventTarget.
 This was added in M142 and can be removed after M144.
 https://issues.chromium.org/issues/346766786

 Killswitch crbug.com/547894783

 Fixes a bug where ancestor elements retain a stale :focus-within
 state if the focused element's subtree is removed during blur
 or focusout events.
 This was added in M147 and can be removed after M149.
 https://issues.chromium.org/issues/454668198
 https://issues.chromium.org/issues/457465869

 Determine clearing of target and relatedTarget by checking
 if the top node is in shadow tree.
 This was added in M142 and can be removed after M144.
 https://issues.chromium.org/issues/373655918
 https://issues.chromium.org/issues/40253359

 Uses ComputeContainerNode() instead of AnchorNode() for clipboard event
 targeting so that kBeforeAnchor/kAfterAnchor selections correctly target
 the containing parent element rather than the element itself.
 See https://crbug.com/40684204

 It is only enabled in extension environment.

 Fix middle-click paste (kSelection buffer) from leaking images on
 the kStandard buffer via the image fallback in GetFragmentFromClipboard.
 crbug.com/497251066

 TODO(crbug.com/440374239): Disabled due to https://crbug.com/440374239.

 Avoid queuing a task to fire a selectionchange event when there is already a task scheduled
 to do that for the target according to the new spec:
 https://w3c.github.io/selection-api/#scheduling-selectionhange-event

 Allows <input type=color> to accept any valid CSS color value
 (named colors, rgb(), hsl(), system colors, etc.) in addition to
 the legacy 7-character hex format (#rrggbb).
 https://crbug.com/40226268
 This was added in M146 and can be removed after M148.

 Enable the display-p3-linear color space in CSS.
 https://chromestatus.com/feature/5162372125818880

 Enable the srgb-linear and display-p3-linear color spaces in
 PredefinedColorSpace.
 https://chromestatus.com/feature/5122501071994880

 Enable the rec2100-linear color space in CSS and PredefinedColorSpace.
 https://chromestatus.com/feature/5204024772788224

 Return the current target from composedPath() while
 dispatching.
 This was added in M142 and can be removed after M144.
 https://issues.chromium.org/issues/444932649
 https://issues.chromium.org/issues/346766786

 Precompute :hover styles and apply hover effects on the compositor
 without involving the main thread.

 When enabled, TimelineTriggers[1] will function via cc::TimelineTrigger
 objects that live on the compositor thread.
 [1] https://drafts.csswg.org/css-animations-2/#timeline-triggers

 If enabled, allow concurrent animations via native paint worklets to
 run on the compositor thread.

 Connection-Allowlist embedded enforcement: the connectionallowlist
 iframe attribute, by which an embedder requires a Connection-Allowlist
 of the document it frames. base_feature_status and
 copied_from_base_feature_if give the origin trial a Finch kill
 switch. See https://github.com/WICG/connection-allowlists/issues/1.

 Enable support for Controlled Frame, providing the Controlled
 Frame tag to IWA apps and other contexts. See
 https://github.com/WICG/controlled-frame/blob/main/README.md for more
 info.

 Enable support for requesting SecurityInfo in WebRequest API
 for controlled frames. See
 https://wicg.github.io/controlled-frame/#dictdef-securityinfo for more
 info.

 Enables setting the maxAge option when creating a cookie in the
 Cookie Store API.

 Feature flag for stripping \t and space from Cookie names and values.
 https://crbug.com/437345480

 Corrects the handling of <form> elements nested within <template> tags
 in HTML parsing. See https://crbug.com/352896478 for details.

 CPU Performance API
 https://chromestatus.com/feature/5189864286978048
 https://github.com/WICG/cpu-performance/

 TODO(crbug.com/547302825): Do not enable this feature before adding
 Permissions Policy support.

 When enabled, allowlisting script urls and scripts used in eval via
 hashes will be supported in script-src. This is a no-op if the
 network::features::kCSPScriptSrcHashesInV1 flag is off, since it
 controls parsing in the network service.
 See crbug.com/392657736 for details.

 The AccentColor And AccentColorText CSS system color keywords

 Maps deprecated ActiveCaption to Canvas instead of CanvasText.
 https://drafts.csswg.org/css-color-4/#deprecated-system-colors
 https://crbug.com/41493724

 Ship in M152, should be removed in M154.
 https://drafts.csswg.org/css-color-5/#relative-alpha
 https://chromestatus.com/feature/5070160203481088

 https://crbug.com/543376113

 Allows using counter() and counters() in alt text (after / in content property).

 https://drafts.csswg.org/web-animations-2/#iteration-composite-operation

 https://drafts.csswg.org/css-values-5/#early-resolution

 Whether <image> values are allowed as counter style <symbol>

 https://drafts.csswg.org/css-counter-styles/#counter-style-speak-as

 https://crbug.com/41089999: Legacy ASCII case-insensitive attribute
 value matching only applies to HTML elements, so SVG and
 empty-namespace elements compare attribute values case-sensitively.
 Enabled by default; kept as a killswitch.

 https://chromestatus.com/feature/6234471210811392
 Ship in M150, should be removed in M152.

 Makes the computed value of the background-* longhands keep the number
 of comma-separated values the author specified, instead of repeating or
 truncating it to the background-image layer count. Repeating and
 truncating are used-value behaviour: "The computed values of the
 coordinating list properties are not affected by such truncation or
 repetition."
 https://drafts.csswg.org/css-values-4/ Appendix A
 https://drafts.csswg.org/css-backgrounds/#layering
 https://github.com/w3c/csswg-drafts/issues/7164

 https://chromestatus.com/feature/5459864205393920
 https://chromestatus.com/feature/5125388091260928

 Attempts to "fold" a calc() value to NaN or +/-Infinity when producing
 a CalculationValue. Can produce incorrect results if the expression
 contains percentages.

 Support CSS Values Level 4 calc simplification and serialization
 as specified in the specs below.
 https://drafts.csswg.org/css-values-4/#calc-simplification
 https://drafts.csswg.org/css-values-4/#calc-serialize

 https://chromestatus.com/feature/5082469066604544

 Two-value caret-color: <color> [<color>]?
 https://github.com/w3c/csswg-drafts/issues/13723

 https://chromestatus.com/feature/6106160780017664

 Support case-sensitive attribute selector modifier
 https://drafts.csswg.org/selectors-4/#attribute-case

 In the cases where it is impossible or impractical to determine the
 measure of the “0” glyph, it must be assumed to be 0.5em wide by 1em
 tall. Thus, the ch unit falls back to 0.5em in the general case, and to
 1em when it would be typeset upright (i.e. writing-mode is vertical-rl or
 vertical-lr and text-orientation is upright).
 https://drafts.csswg.org/css-values-4/#ch
 See crbug.com/416145497 for more details.

 https://drafts.csswg.org/css-values-5/#progress
 container-progress()

 https://drafts.csswg.org/css-conditional-5/#typedef-style-range

 https://drafts.csswg.org/css-borders-4/#corner-shaping

 https://drafts.csswg.org/css-lists-3/#counter-reset
 https://crbug.com/40760770

 The symbols() function for defining an anonymous counter style inline.
 https://drafts.csswg.org/css-counter-styles-3/#symbols-function

 Unprefixed cross-fade() (in addition to the existing -webkit-cross-fade()).
 https://drafts.csswg.org/css-images-4/#cross-fade-function

 Include custom properties in CSSComputedStyleDeclaration::item/length.
 https://crbug.com/949807

 The 'flow-start' and 'flow-end' box alignment keywords.
 https://github.com/w3c/csswg-drafts/issues/14052

 Serialize 'flex-start' and 'flex-end' as 'flow-start' and 'flow-end'
 in computed styles.
 https://github.com/w3c/csswg-drafts/issues/14052

 crbug.com/483689942
 Serialize font-family names as space-separated idents when possible,
 per CSSWG resolution. See https://github.com/w3c/csswg-drafts/issues/5846.

 https://drafts.csswg.org/css-mixins-1/#function-rule

 This needs to be kept as a runtime flag as long as we need to forcibly
 disable it for WebView on Android versions older than P. See
 https://crrev.com/f311a84728272e30979432e8474089b3db3c67df

 https://drafts.csswg.org/css-values-5/#ident

 https://chromestatus.com/feature/5078177326170112

 image(<color>) functional notation, producing a solid-color image
 with no natural dimensions.
 Ship in M150, should be removed in M152.
 https://drafts.csswg.org/css-images-4/#funcdef-image
 https://chromestatus.com/feature/5121011285622784

 The inherit() function works like var(), except that it grabs
 the computed value of the specified property from the parent style
 instead of the current style.

 https://drafts.csswg.org/css-values-5/#inherit-notation

 The :in-range and :out-of-range pseudo-classes support matching against
 <input type=time> elements with a reversed range.
 https://html.spec.whatwg.org/multipage/input.html#has-a-reversed-range

 https://chromestatus.com/feature/6289894144212992

 Support for extended language ranges in :lang()
 https://chromestatus.com/feature/5071058079055872

 light-dark() for image values (background-image, etc.)
 Ship in M150, should be removed in M152.
 https://drafts.csswg.org/css-color-5/#light-dark
 https://chromestatus.com/feature/5123253146353664

 https://chromestatus.com/feature/5095153430822912

 Implements counter-increment and counter-set for the non-<li>
 elements and the reversed ordered lists.

 https://crbug.com/40682542

 Allows pseudo-element selectors within logical combination pseudo-
 classes, e.g. :is(div::before).

 https://crbug.com/444386484

 https://github.com/explainers-by-googlers/css-shrink-to-fit

 Pseudo-classes :playing, :paused, :seeking, :buffering, :stalled,
 :muted, and :volume-locked for media elements.
 https://drafts.csswg.org/selectors/#resource-pseudos

 https://drafts.csswg.org/css-values-5/#progress
 media-progress()

 https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle

 Ignore the stylesheet encoding when parsing URLs, always using UTF-8.
 See crbug.com/1485525.

 Support polygon(round <length>, ...) per CSS Shapes Level 1.
 Spec: https://www.w3.org/TR/css-shapes-1/#typedef-basic-shape
 Issue: https://crbug.com/329302249
 https://chromestatus.com/feature/6636392944893952
 Ship in M150, should be removed in M152.

 Support for position-visibility: anchor-valid.
 See crbug.com/333421963.

 The @private rule declares lexically-scoped custom properties that are
 visible only within the enclosing style rule and the elements it
 matches, with their names rewritten so they are never observable as
 author custom properties.
 crbug.com/542651959

 https://drafts.csswg.org/css-values-5/#progress
 progress()

 For ::column pseudo-element for fragment styling.
 https://github.com/flackr/carousel/blob/main/fragmentation/README.md

 CSSPseudoElement.selectorText.
 https://drafts.csswg.org/css-pseudo-4/#dom-csspseudoelement-selectortext

 Enables the :has-slotted pseudo-selector.
 https://chromestatus.com/feature/5134941143433216

 For ::scroll-up-button and ::scroll-down-button pseudo-elements for Carousel.
 https://github.com/flackr/carousel/tree/main/scroll-button

 For ::scroll-marker and ::scroll-marker-group pseudo-elements for Carousel.
 https://github.com/flackr/carousel/tree/main/scroll-marker

 Non-standard 'auto' keyword for the CSS resize property. Used for
 selectively enable resize corner for textarea via UA stylesheet, but
 unintentionally exposed to author sheets. UA rule is now using
 -internal-textarea-auto instead.

 Kill switch for integrity() enforcement on CSS image and SVG
 document resources. See also: CSSURLRequestModifiers

 https://drafts.csswg.org/css-ruby/#ruby-overhang
 ChromeStatus: https://chromestatus.com/feature/6560118298771456

 The '&' pseudo-class effectively behaves like :where(:scope)
 when used in @scope rules.

 The "@import scope(...)" syntax.
 https://github.com/w3c/csswg-drafts/issues/7348

 https://drafts.csswg.org/css-conditional-5/#scrolled

 https://drafts.csswg.org/css-scroll-snap-2#scroll-initial-target

 https://github.com/w3c/csswg-drafts/issues/12122

 https://drafts.csswg.org/css-overflow-5/#active-before-after-scroll-markers
 :target-before and :target-after pseudo classes for scroll markers.

 https://drafts.csswg.org/css-scroll-snap-2/#scrollsnapchange

 https://drafts.csswg.org/css-scroll-snap-2/#scrollsnapchanging

 https://drafts.csswg.org/css-scroll-snap-2/#snapevent-interface

 https://drafts.csswg.org/css-scroll-snap-2/#snap-events

 scroll-target-group property
 https://drafts.csswg.org/css-overflow-5/#scroll-target-group

 scroll-target-group property sets aria-current=true on :target-current html scroll marker.

 path() and shape() basic shapes for shape-outside.
 https://drafts.csswg.org/css-shapes-1/#basic-shape-functions
 https://drafts.csswg.org/css-shapes/#shape-outside-property
 ChromeStatus: https://chromestatus.com/feature/5080980370096128

 rect() and xywh() basic shapes for shape-outside.
 https://drafts.csswg.org/css-shapes-1/#basic-shape-functions
 https://drafts.csswg.org/css-shapes/#shape-outside-property
 ChromeStatus: https://chromestatus.com/feature/6323071520735232

 https://drafts.csswg.org/cssom-1/#dom-cssstylesheetinit-baseurl

 https://chromestatus.com/feature/5153932394102784
 Shipping in M150, so flag can be removed around M152.

 Allows the CSS "accent-color" property to support the system accent color as the default option.

 https://issues.chromium.org/40787216: CSS text-align: match-parent value

 crbug.com/468928416, crbug.com/498974811

 https://issues.chromium.org/40675832: CSS text-decoration-skip-ink: all value

 crbug.com/417306102

 crbug.com/417306102

 crbug.com/1463890, crbug.com/1463891: CSS text-spacing shorthand

 https://crbug.com/40928177: Support of text-transform: full-size-kana

 https://issues.chromium.org/41297237: CSS text-transform: full-width value

 crbug.com/41297237: Support multi-keyword values in CSS text-transform.

 Support for the 'all' keyword of the 'timeline-scope' property.

 https://drafts.csswg.org/scroll-animations-1/#timeline-scope

 Makes timeline names global by default.

 https://github.com/w3c/csswg-drafts/issues/12581

 Support tree-scoped scroll and view timeline names according to the
 CSSWG resolution on tree-scoped references.

 CSS URL request modifiers: cross-origin(), integrity(),
 referrer-policy() inside url() functions.

 https://drafts.csswg.org/css-values-5/#request-url-modifiers

 Support for user-select:contain.

 https://crbug.com/488305665: Support :user-valid/:user-invalid for radio buttons.
 This lands in M147, and the flag can be removed in M149.

 https://drafts.csswg.org/selectors-4/#user-valid-pseudo

 https://chromestatus.com/feature/4850737974345728

 CSSWG resolution to make the zoom property continuously
 interpolatable. https://github.com/w3c/csswg-drafts/issues/10872
 Ship in M150, should be removed in M152.
 ChromeStatus: https://chromestatus.com/feature/5183671737909248

 Shipping in M148 (or backported earlier), can be removed in M150.

 appearance:base for the <datalist> element when it is invoked as a
 picker from an <input type=text>.
 https://issues.chromium.org/issues/453705243
 https://chromestatus.com/feature/5067156794507264

 appearance:base-select for <select multiple size=1> with a picker.

 Adds new UA styles for customizable select from CSSWG discussions.
 https://chromestatus.com/feature/6270612585709568

 see crbug.com/341313078

 https://chromestatus.com/feature/5134293578285056

 https://crbug.com/473454959

 https://crbug.com/448174611

 https://crbug.com/448174611

 Declarative WebMCP: tools declared via HTML <form> attributes
 (toolname, tooldescription, ...), and the associated CSS
 pseudo-classes and SubmitEvent extensions. It builds on top of the
 imperative WebMCP feature (document.modelContext).

 This shares the "WebMCP" origin trial with imperative WebMCP, so that
 declarative WebMCP keeps working for origin trial participants, while
 still being independently controllable (e.g. kill-switchable) through
 its own base feature. Declarative WebMCP builds on the imperative
 infrastructure, so C++ callers should use
 ModelContext::IsDeclarativeWebMCPEnabled(), which also requires
 WebMCP to be enabled (and thus honors the kWebMCP kill switch).
 depends_on can't be used here since depending on an origin trial
 feature is not supported.

 Overriding the kWebMCP base feature (e.g. --enable-features=WebMCP)
 also sets this feature; see content/child/runtime_features.cc. An
 explicit kDeclarativeWebMCP override takes precedence.

 Killswitch for https://crbug.com/400317114 fix.
 This lands in M142, and the flag can be removed in M144.

 This allows pages to opt out of the unload deprecation. Enabling this
 allows unload event handers to be used in the frame regardless of any
 Permissions-Policy setting.
 https://crbug.com/1432116

 crbug.com/520262209: This feature makes the <dialog> element close
 properly when its "open" attribute is removed. See
  - https://github.com/whatwg/html/issues/5802
  - https://github.com/whatwg/html/pull/10124

 Experimental support for the Direct Sockets API in Service Workers.
 https://github.com/WICG/direct-sockets

 Experimental support for the Direct Sockets API in Shared Workers.
 https://github.com/WICG/direct-sockets

 Switch from ellipsis to clip when a container is scrolled.
 This shipped in M146 and the flag can be removed in M148.

 Prevents the change event from being fired within
 HTMLFieldSetElement::ChildrenChanged because we aren't supposed to
 fire events during mutations like that.
 https://issues.chromium.org/issues/523756329
 https://issues.chromium.org/issues/523748081
 https://issues.chromium.org/issues/523737685
 Enabled in 151, safe to remove in 153.

 kHidden and kHiddenButPainting visibility states are treated as
 hidden in the sense of document.visibilityState.  However, they are
 handled differently internally.  For example, video playback should
 continue in kHiddenButPainting, such as when the page is being
 background captured.  When enabled, this feature causes blink to
 notify internal observers about visibility changes between the two
 hidden states, in addition to transitions to/from kVisible.

 Since the two hidden states are exposed to the web identically, there
 is no visibilitychanged event fired when switching between them.

 When this feature is disabled, blink reverts to its original behavior
 of eliding transitions between the two hidden states, including to
 internal observers.  This behavior causes problems with capture and
 picture-in-picture, but is preserved as a safe fallback.

 Dispatch selectionchange event per element according to the new spec:
 https://w3c.github.io/selection-api/#selectionchange-event

 Dispatches a securitypolicyviolation event for CSP violations
 detected while fetching a worker's or worklet's module graph
 (top-level script, redirects, and nested static imports).
 See https://crbug.com/40612680

 Allowing elements with display:contents to have focus.
 See https://crbug.com/1366037

 Enables DocumentIsolationPolicy.
 See https://https://github.com/WICG/document-isolation-policy.

 Kill switch for including non-exposed <object> and <embed> elements in
 document named properties. crbug.com/551807991
 Lands in M155 and can be removed in M157.

 Fix iframe unload events not firing during document.open()
 https://crbug.com/40947017
 Lands in M144; remove this flag in M146 after the milestone rolls.

 https://chromestatus.com/feature/5111042975465472
 <template patchfor> etc.

 Enables preferInitialWindowPlacement Document PiP option to skip
 re-using the previous pip window bounds.

 Enables propagating user activation from a document picture-in-picture
 window up to its opener window and vice versa.

 Enables the ability to use Document Policy header to control feature
 DocumentDomain.

 Enables the ability to use Document Policy header to control feature
 ExpectNoLinkedResources.

 Enables the ability to use Document Policy header to control feature
 IncludeJSCallStacksInCrashReports. https://chromestatus.com/feature/4731248572628992

 Enables Document Policy for DedicatedWorkers.

 Enables the ability to use Document Policy header to control feature
 NetworkEfficiencyGuardrails. https://chromestatus.com/feature/5156240166223872

 Enables the ability to use Document Policy header to control feature
 SyncXHR.

 Kill switch for marking scripts parsed by DOMParser in XML documents as
 "already started" so they stay inert when cloned or imported.
 https://crbug.com/542115030

 https://chromestatus.com/feature/4909387902746624
 Enables dragging multiple files out of a web page via the
 DownloadURL-list drag type.

 Enables JS-constructed File objects (e.g. new File([bytes], 'photo.jpg'))
 to carry their blob contents through the drag-and-drop pipeline.
 When disabled, only the filename is sent as text/plain (legacy behavior).

 When enabled, drag image previews are generated for images regardless
 of their intrinsic size (the output is still clamped to
 MaxDragImageSize). When disabled, images whose intrinsic area exceeds
 kMaxOriginalImageArea produce no drag preview (legacy behavior). Acts
 as a kill switch for the removal of that cap. See
 https://crbug.com/518266739

 When enabled, the cursor needs to move past the drag start threshold in
 absolute screen coordinates rather than window relative coordinates.
 See https://crbug.com/40943926 and
 https://html.spec.whatwg.org/multipage/dnd.html#security-risks-in-the-drag-and-drop-model

 See: crrev.com/c/7874048
 Diagnostic flag to gather data for a case when compositable animations lack snapshots without a known reason.

 See https://crbug.com/443612843

 Schedule a main frame when EditContext.updateControlBounds() or
 updateSelectionBounds() changes the bounds of the active EditContext,
 so the new bounds are sent to the browser in TextInputStateChanged even
 when called from an async task that doesn't otherwise cause a frame.

 Support code point-based deletion calculations in
 DeleteSurroundingTextInCodePoints() for EditContext.

 See https://crbug.com/379170477

 Update EditContext selectionStart/End before TextUpdateEvent while
 handling deletion. See https://crbug.com/529413105

 Elastic overscroll requires even solid color background to be painted
 in the border box space to ensure they aren't shifted away.

 Uses the original event delta to choose the initial elastic overscroll
 axis.

 ElementInternals.behaviors allows web authors to attach
 platform-provided behaviors to custom elements, enabling
 them to adopt native behaviors without extending native
 elements.
 crbug.com/486928684
 https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/PlatformProvidedBehaviors/explainer.md

 When enabled, the readonly attribute will prevent constraint validation
 only in some cases, depending on the element.
 This was added in M147 and can be removed after M149.
 https://issues.chromium.org/issues/486228104

 This was added in M151 and can be removed after M153.
 https://issues.chromium.org/issues/525074815

 Kill switch for https://crbug.com/41384307.

 Controls whether XSLT processing is selectively re-enabled for
 Common Alerting Protocol (CAP) alert XML documents when native XSLT
 is otherwise disabled.
 crbug.com/435623334.

 When enabled, the LCP algorithm ignores image entropy for the first
 video frame. See crbug.com/434659232.

 event.pseudoTarget property to represent pseudo-elements in events. Returns CSSPseudoElement or null.

 Kill-switch for https://chromestatus.com/feature/5153386492198912
 Added in M144, can be removed in M146.

 Interoperable dispatch timing for transitionrun and media query events.
 https://chromestatus.com/feature/6312504658624512

 https://drafts.csswg.org/web-animations-2/#triggers

 Kill-switch for crbug.com/40434449.
 Added in M139, and it can be removed in M141.

 Allows fenced frames to access unpartioned data via Shared Storage in
 exchange for disabling untrusted network access. This is the Blink
 counterpart of the base::Feature with the same name. Because local
 unpartitioned data access requires browser and renderer process
 coordination, the value of this flag is strictly controlled by the
 base::Feature variant, and setting this flag does nothing.

 Add Request.bytes() and Response.bytes()
 https://chromestatus.com/feature/5239268180754432

 The Blink runtime-enabled feature name for the API's IDL.
 https://chromestatus.com/feature/4654499737632768

 The retry ability for Fetch keepalive requests.
 https://chromestatus.com/feature/5181984581877760

 Also enabled when blink::features::kFileHandlingAPI is overridden
 on the command line (or via chrome://flags).

 For <input type=file>, fires change event when same file is chosen
 again, and retains files when cancel is pressed.

 Shared objects by OPFS and non-OPFS File System Access API.

 In-development features for the File System Access API.

 The FileSystemHandle.getCloudIdentifiers() method (see
 crbug.com/1443354).

 Non-OPFS File System Access API.

 OPFS File System Access API.

 When enabled, calling remove() on a FileSystemAccessHandle will also
 update the permission grants for the associated path. Restored after
 next write to the path.
 See crbug.com/421690393.

 Controls the internal write-only mode for various FileSystemAccess API.
 This covers mostly content layer and does not expose any write mode to
 user visible APIs.
 This flag is part of crbug.com/421690393 and crbug.com/328458680.

 The FileSystemObserver interface for the File System Access API.
 See https://crbug.com/1019297.

 The unobserve function of the FileSystemObserver.
 See https://crbug.com/321980469.

 Adds the filter attribute to the input element, which targets a
 listbox select element to perform filtering.

 Fix for https://crbug.com/41153707

 Enables the beforefilter event and the option.filtered IDL, which are
 shared primitives needed by both the FilterableSelect and
 CustomizableCombobox features.

 Fix for https://crbug.com/558819236

 crbug.com/553136688 and crbug.com/553252820

 https://github.com/w3c/csswg-drafts/issues/13926

 It turned out that this fix was wrong. The plan is to turn it off, and
 remove if that goes well. crbug.com/41362700

 When enabled, HTMLFormControlElement::IsReadOnly() returns false for
 types that don't support readonly.

 Fix a bug in the <map> element's caching of the name attribute. This
 flag was added in M148, and can be removed in M150.

 Guard the kStart / kEnd / kStartAndEnd branches of
 LayoutSelection::ComputeSelectionStatus against std::nullopt
 start_offset / end_offset in SelectionPaintRange.
 See https://crbug.com/489028874

 Fix LayoutView viewport mapping in the GeometryMapper fast path for
 OOPIFs.

 Enables deal support within auctions.

 Enables using a 'deprecatedRenderURLReplacements' field within the
 Protected Audience ad auction config.

 Feature flag to control removal, in case we run into unexpected
 breakage.

 TODO(crbug.com/384481095): Remove in a few milestones, along with the
 implementation code.

 Enables the private model training API in Protected Audience.
 https://github.com/WICG/turtledove/blob/main/PA_private_model_training.md

 Enables real time reporting API in Protected Audience.
 https://github.com/WICG/turtledove/blob/main/PA_real_time_monitoring.md

 Enables the ability to set seller nonces on the header response and
 use bidNonce in bids.

 Enables having executionMode in the auctionConfig to use for seller scripts.

 https://open-ui.org/components/scoped-focusgroup.explainer/

 https://open-ui.org/components/focusgroup-v2.explainer/

 Fires a "focusreset" event at a Document during "update the rendering"
 when its focused element was removed and focus was not explicitly
 moved since. https://github.com/whatwg/html/pull/13050

 Respects explicit outline colors for focus rings in dark mode and uses
 an off-white default. https://issues.chromium.org/issues/480978106

 crbug.com/40398871

 crbug.com/41170551

 Kill switch for https://crbug.com/489865845.

 crbug.com/393391746

 crbug.com/325826179

 crbug.com/40398871

 TODO(crbug.com/1231644): This flag is being kept (even though the
 feature has shipped) until there are settings to allow users to
 customize the feature.

 https://github.com/flackr/reduce-motion/blob/main/explainer.md

 Flag for rolling out the standardized behavior where fetch calls are
 rejected with the reason provided to the abort controller, if one was
 provided. See crbug.com/502133195

 https://crbug.com/40384509.

 Generate layout fragments for out-of-flow positioned elements as
 children of their actual containing block - ALSO when inside block
 fragmentation, such as multicol. See crbug.com/40267498

 crbug.com/570740320

 When enabled, the drag image overlay for an element will be created
 before the "dragstart" event is fired. This fixes a bug that made
 drags not start if the "dragstart" event caused a layout shift that
 made the mouse hit test miss the drag source.

 Killswitch for the visible deprecation warning banner shown on
 XSLT-transformed documents. This will be present until the banner is
 removed in M158.

 Tracking bug for the implementation: https://crbug.com/430204832

 A feature flag that controls whether the geometry mapper singular
 transform fix is enabled.
 https://issues.chromium.org/issues/441128445

 GeometryUtils mixin.
 https://drafts.csswg.org/cssom-view/#the-geometryutils-interface

 GeometryUtils for CSSPseudoElement interface.
 https://www.w3.org/TR/cssom-view-1/#the-geometryutils-interface

 When a Web application calls getDisplayMedia(), allow a hint to be
 provided as to whether the Web application prefers prioritizing audio
 capture.

 https://w3c.github.io/mediacapture-screen-share/#dom-displaymediastreamoptions-audioselection

 When a Web application calls getDisplayMedia() and asks for audio,
 allow a hint to be provided as to whether the Web application is
 interested in audio being among the options offered to the user
 on window display surfaces.

 https://www.w3.org/TR/screen-capture/#dom-displaymediastreamoptions-windowaudio

 To filter only elements in the HTML namespace when calling
 getElementsByName().
 This was added in M141 and can be removed after M143.
 https://issues.chromium.org/issues/40502558

 Performs retargeting on the output of InputEvent.getTargetRanges() to
 prevent leaking nodes in shadow roots.

 Gates the navigator.globalPrivacyControl JavaScript API.

 TODO(crbug.com/333628468): Enables the headingoffset and
 headingreset attributes, which allow for alternate styles of building
 structured headings. This is being actively prototyped, starting ~M136.
 For more see https://github.com/whatwg/html/issues/5033

 Kill switch for setting display: none on the media controls
 container when it is not needed.
 Lands in M147 and can be removed in M149. https://crbug.com/40591804

 Fixed https://crbug.com/456164629, so this will be shipped in M150
 and can be removed in M152.

 Use container_transform_state instead of local_transform_state when
 computing z-depth for depth ordering in preserve-3d hit testing.
 Fixes incorrect hit-test results for layers without CSS transforms.
 https://crbug.com/464173566

 Extra steps in HTML Agency Adoption algorithm to remove elements from the
 formatting list when the internal loop reached the maximum number of
 iterations. This shipped in M148 and the flag can be removed in M150.

 Kill switch for making <area> display:none by default according to the
 HTML rendering specification. https://crbug.com/1231263

 Kill switch for parsing <body>, <frame> and <iframe> margin attributes
 as pixel lengths per the HTML rendering rules.
 https://crbug.com/554920796

 Additional default command/commandfor actions that aren't part of v1 of
 commands. When this flag is disabled only v1 actions (popover and dialog
 defaults) will work.

 Remove support for the <command> element from the HTML parsing logic.
 This shipped in M148 and the flag can be removed in M150.
 https://issues.chromium.org/issues/491158089
 NOTE: when this flag is removed, be sure to also remove "command"
 from third_party/blink/renderer/core/html/html_tag_names.json5.

 Adds support for scroll commands such as 'page-up' and 'page-block-end'.
 https://github.com/danielsakhapov/declarative-scroll-commands-for-html-explainer

 Adds support for the ::interest-button pseudo element, which is a sub-
 feature of the interest invokers feature.
 https://open-ui.org/components/interest-invokers.explainer/

 Prevents the HTMLLinkElement processing model from being invoked when
 attributes are processed but their value doesn't change. See
 https://crbug.com/41436016.

 Kill switch for ignoring head start tags in the "in head noscript"
 insertion mode. https://crbug.com/40775952

 Killswitch for crbug.com/40727112: emit a bogus comment for an
 incomplete markup declaration at end of input instead of dropping the
 rest of the document.

 A flag, just for local testing to make the
 HTML parser yield more often and take longer to resume.
 This helps when debugging flaky tests caused by parser
 yielding heuristics.

 When enabled, specifies visual affordances for printing such as headers,
 footers and page numbers, to be PDF annotations.
 See section 14.8.2.2.1 here for info:
 https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf

 Parse processing instructions in HTML.

 Enables the switch attribute on <input type="checkbox">.
 https://open-ui.org/components/switch.attribute.explainer/

 Use orientation segmentation for hyphenation strings in vertical mixed
 text, so characters such as "+=" render sideways instead of upright.
 https://crbug.com/562849567

 Srcset images respond to viewport/zoom changes by
 re-selecting the best candidate, including for
 x-descriptors.
 https://crbug.com/41385706

 Support for https://www.w3.org/TR/IFT/. Tracked at
 https://chromestatus.com/feature/5135917565214720.

 If a painting bug no longer reproduces with this feature enabled, then
 the bug is caused by incorrect cull rects.

 Initial letter block-axis positioning fixes. See crbug.com/573256240

 See crbug.com/40695399

 See crbug.com/40910996 crbug.com/569803503

 If enabled, and the inner html parser is unable to successfully
 parse, it will log histograms of why it failed. The logging is
 non-trivial.

 Text fields leave the inline padding out of their client rect and
 scroll size, matching where they clip their text. Kill switch.
 https://github.com/w3c/csswg-drafts/issues/13502

 Prevents running DefaultEventHandler on disabled input elements.
 Enabled in M153, safe to remove in M155.
 https://issues.chromium.org/issues/533188858

 The HTML parser inserts a </select> end tag before inserting <input>
 when parsing inside of a <select> tag. We want to allow <input> inside
 <select>, but it isn't web compatible enough. This flag allows <input>
 inside <select> but only if there is another open tag in between the
 <input> and the <select>, like <select><div><input>.
 For now, this flag also makes <input> close <select> like it used to
 when the <input> is put directly within an <option> or <optgroup>.

 Enables InputMultipleFieldsUI on all platforms by tweaking the inner
 fields to be non-focusable and making the whole input element
 focusable for coarse input devices. When this flag is removed, the
 InputMultipleFieldsUI flag can also be removed.

 Enables the alpha and colorspace content/IDL attributes on
 <input type=color>, allowing alpha and Display P3 color values.
 https://html.spec.whatwg.org/multipage/input.html#dom-input-colorspace
 https://html.spec.whatwg.org/multipage/input.html#dom-input-alpha
 https://chromestatus.com/feature/5736024861966336

 Insert a blockquote before a outer block after creating the blockquote
 when indenting a node whose outer block is a blockquote. See
 https://crbug.com/327665597

 https://chromestatus.com/feature/5152834368700416

 Fixes a bug in the implementation of interest and loseinterest
 events - they should not be composed events.
 This shipped in M149 and can be removed in M151.

 If enabled, BeginMainFrame will always be requested when there are
 active IntersectionObservers and also active composited animations.

 Checks interactive content using EventPath captured at
 dispatch start instead of current DOM state. This was
 added in M145 and can be removed after M147.
 https://issues.chromium.org/issues/452084024

 When enabled, brings chromium into compliance with the resolution of:
   https://github.com/whatwg/html/issues/10671
 This flag can be used to easily revert to the old behavior if the new
 behavior causes breakage; otherwise, it can be removed after M145
 reaches stable.

 Enables the loading attribute for video and audio elements,
 allowing lazy loading similar to images.
 https://crbug.com/469111735

 Defers parsing of declaration blocks in inline <style> elements until
 a rule is first matched, the same treatment network-fetched
 stylesheets already get in StyleSheetContents::ParseAuthorStyleSheet.
 Rules that never match never pay for their declarations.

 Allow triggering the word suggestion from left click.
 From crbug.com/433209485

 Keeps the legacy container attributes (startContainer/endContainer)
 on AbstractRange. These attributes move to a new NodeRange interface
 between AbstractRange and Range/StaticRange. This is forced to the
 inverse of the global OpaqueRange runtime flag in
 content/child/runtime_features.cc. Remove when the OpaqueRange flag is
 removed. crbug.com/421421332

 Makes light dismiss for popovers and dialogs use the click event
 instead of pointerdown and pointerup in order to fix light dismiss
 bugs for touch inputs.
 https://issues.chromium.org/issues/408010435

 Clear stale shaping when a line-breaking retry overflows.
 https://crbug.com/559557312

 crbug.com/542686223 crbug.com/568304685

 Reverse origin trial allowing sites to opt out of Local Network Access
 restrictions for WebRTC.

 Enable sourceCharPosition for the invoke-type resolve-promise
 https://issues.chromium.org/issues/381529126

 Enable retrieving sourceLine and sourceColumn in LoAF implementation.
 https://issues.chromium.org/issues/391417815

 Add sourceLine and sourceColumn to PerformanceScriptTiming
 https://issues.chromium.org/issues/391417815

 Add styleDuration and layoutDuration to
 PerformanceLongAnimationFrameTiming and forcedStyleDuration and
 forcedLayoutDuration to PerformanceScriptTiming

 Extends the Long Animation Frame (LoAF) API to Web Workers. Reports a
 long task blocking a worker's event loop as a "long-animation-frame"
 entry, observable from inside the worker. See the loaf-congested-moments
 explainer: https://github.com/WICG/delayed-message-timing

 https://crbug.com/572893186

 Long press on a link selects the link text instead of bringing up
 context menu. Enabled only on Android AuthView.

 Kill-switch for releasing the :active state when a touch long-press is
 lifted, and for making context-menu focus hit tests read-only.
 https://crbug.com/358393574

 Use LongAnimationFrameMonitor to emit longtask entries

 Read font weight from the OpenType OS/2 table first during macOS font
 family style matching, falling back to AppKit/CoreText weights if the
 OS/2 table is unavailable. See https://crbug.com/543243014.

 CSS margin-trim property: https://drafts.csswg.org/css-box-4/#margin-trim

 Enables MathMLAnchorElement

 Enables mirroring for stretchy and large MathML operators when
 the text direction is right to left.

 Set to reflect the kMediaEngagementBypassAutoplayPolicies feature.

 This feature helps to add memory consumer to NGShapeCache, so that
 the cached shape results would be cleared once exceeding the memory limit.

 This is enabled by default on Windows only. The only part that's
 "experimental" is the support on other platforms.

 Killswitch for crbug.com/40062462 fix.

 Stops caching failed module fetches (network error, non-ok status, or
 MIME type mismatch), so a later import re-fetches instead of reusing the
 failure.
 https://html.spec.whatwg.org/C/#fetch-a-single-module-script
 https://crbug.com/534781954

 ModulePreloadReferrer enables modulepreload to send proper referrer
 headers as specified in the HTML spec.
 https://crbug.com/441933555

 https://crbug.com/466888680

 MojoJSTest is used exclusively in testing environments, whereas MojoJS
 may also be used elsewhere.

 Optimization for monospace text.

 Move the selection to the last position in the list item. See
 https://crbug.com/331841851

 https://issues.chromium.org/issues/41015847
 This will be shipped in M151, and it can be removed in M153.

 Support Nastaliq script. crbug.com/569667449

 NavigationState class and the :navigation-source CSS pseudo-class.

 Exposes navigation redirect timing (redirectCount, redirectStart and
 redirectEnd) for cross-origin redirect chains when every redirect opts
 in to the navigation's destination origin via Timing-Allow-Origin and
 the navigation is not a no-referrer navigation.
 https://github.com/whatwg/fetch/pull/1931
 https://github.com/whatwg/html/pull/12513

 Support <navigation-type-test> and <navigation-phase-test>.

 See crbug.com/567611289
 Per https://www.w3.org/TR/web-animations-1/
 #the-effect-value-of-a-keyframe-animation-effect:
 Keyframes not affecting the target property are to be removed prior
 to populating interval endpoints. Blink's longstanding behavior was
 not spec-compliant. Introducing a kill-switch to allow a quick revert
 should this be a breaking change for sites.

 See crbug.com/521921832
 Any potential behavioral changes excepting bugfixes from the V2 implementation (including
 changes to when the histogram is reported, like early-outs in Animation::PreCommit) are behind
 this flag, for safety and consistent reporting on the V1 enum while it is still supported.

 https://chromestatus.com/feature/5054329641893888
 streamHTML, appendHTML, etc.

 Fix for https://crbug.com/482862753

 Fix for https://crbug.com/522844903, a regression from
 crrev.com/c/7617189. Gated behind its own flag rather than
 changing NoExtendSelectionToUserSelectNoneOutOfFlow's behavior.

 This turns off all font antialiasing for tests unless it is
 explicitly required and enabled using the
 "--enable-font-antialiasing" flag like in the case of
 "virtual/text-antialias/" virtual test suite.
 crbug.com/339041663

 When copying, a lone space between two inline elements is kept as an
 ordinary breaking space instead of being converted to a non-breaking
 space. Spaces at the selection edges and runs of two or more spaces are
 still converted to non-breaking spaces. See https://crbug.com/448047353

 Doesn't insert empty blockquotes on outdenting a blockquote. See
 https://crbug.com/323960902

 TODO(crbug.com/1426629): This feature enables the deprecated value
 slider-vertical. Disable this feature to stop parsing or allowing these
 values.
 https://drafts.csswg.org/css-ui-4/#appearance-switching

 Normalizes CRLF and standalone CR to LF in execCommand("insertText")
 for consistent newline handling in contenteditable elements.
 See https://crbug.com/41289410

 Dispatch an error event for the cross-origin violation for the worker
 script URL fetching, instead of throwing error synchronously on worker
 construction.
 See https://github.com/whatwg/html/issues/337

 NotificationContentImage is not available in all platforms
 The Notification Center on Mac OS X does not support content images.

 Notify selection controller of selection changes even when the new
 selection matches the old selection, keeping the selection state in
 sync. This flag ships in M151 and can be removed in M153.

See crbug.com/512385682

 Kill switch for a fix to offset-path transform invalidation for
 https://crbug.com/463409688.

 iframes send pagehide/unload/visibilitychange when removed.
 This not spec-compliant, but might have web-compat consequences.
 This flag omits firing those events on element removal.

 Skip layout of all out-of-flow positioned elements if side-effects are
 disabled. See DisableLayoutSideEffectsScope.

 The OpaqueRange interface provides a live AbstractRange subtype
 for encapsulated content within <textarea> and <input> elements.
 "This can be removed in M155. crbug.com/421421332

 Restrict popover invoker lookup to the same TreeScope as the element.
 This will be shipped in M142, and it can be removed in M144.
 See https://issues.chromium.org/issues/443031270.

 Makes option elements match :enabled or :disabled based on whether
 their ancestor select element is disabled.
 https://github.com/w3c/csswg-drafts/issues/13383
 https://issues.chromium.org/issues/490082172
 Enabled in M149, modified in M151, safe to remove in M153.

 Define a sample API for testing integration with the Origin Trials
 Framework. The sample API is used in both unit and web tests for the
 Origin Trials Framework. Do not change this flag to stable, as it exists
 solely to generate code used by the sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.
 TODO(yashard): Add tests for this feature.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 As above. Do not change this flag to stable, as it exists solely to
 generate code used by the origin trials sample API implementation.

 Improves the performance of the global overlay:none!important UA style
 rule by replacing the normal UA style rule with other things which
 result in the same behavior. Added in M147, should be safe to remove
 in M150.

 Enables the CSS overlay property. When this flag is disabled, top
 layer exit animations will work without the need for using the overlay
 property.

 https://chromestatus.com/feature/5261280285949952

 PARAKEET ad serving runtime flag/JS API.

 This is to add an option to enable the Reveal button on password inputs while waiting ::reveal gets standardized.

 Lets a payment app set the size of its Payment Handler window through
 the preferredSize option of PaymentRequestEvent.openWindow().

 https://chromestatus.com/feature/5198846820352000

 PaymentRequest is enabled by default on Android

 Sends custom user timing events in subframes to the browser process.
 crbug.com/467177770 for more details.

 Enables performance.mark('mark_feature_usage'): crbug.com/1517170

 Enables the <persistentwidget> element, which is like an <iframe> but
 can stay alive without reloading when its opener/embedder navigates
 from one same-origin document to another.
 There are checks for this flag in content/browser, which means that
 setting status to "experimental" would not actually enable this
 feature, it has to be "stable" in order for it to actually get enabled
 in the browser process. Manual and automated tests must pass the
 --enable-features=PersistentWidgetAPI command line flag to the
 browser.

 This is a reverse OT used for a phased deprecation.
 https://crbug.com/918374

 Flag for enabling the pointer lock API on Android

 https://crbug.com/404479704

 Makes showPopover() throw an exception instead of just logging a console
 message when calling showPopover() within another popover hide/show
 operation. https://crbug.com/527495812

 Simplifies the behavior and stacking interactions of popover=hint and
 popover=auto. See https://crbug.com/499019927.
 This shipped in M150, was disabled via Finch, and was re-enabled in
 M151. The behavior was tweaked slightly in M153, and milestones
 now happen twice as quickly, so the flag can be removed in M157.

 Kill switch for requiring and consuming transient user activation in
 the browser process when creating a form-control popup widget,
 guarding against compromised renderers opening popups without a user
 gesture.
 See https://crbug.com/506152584.

 Kill switch for https://crbug.com/448173938 which changes position
 visibility to ignore non-clipping ancestors.

 Enables the "singular" versions of two values for the CSS
 position-visibility property: anchor-valid and anchor-visible.
 See crbug.com/526682332.

 Adds a web setting to disable CSS ScrollbarColor, ScrollbarWidth, and
 legacy ::-webkit-scrollbar* pseudo-element styling.

 Prefer not using composited scrolling. Composited scrolling will still
 be used if there are other reasons forcing compositing. For consistency,
 any code calling Settings::GetPreferCompositingToLCDTextEnabled() should
 ensure that this flag overrides the setting.

 Used to allow preloading data: URLs with link rel=preload.
 https://crbug.com/348442535

 Kill switch for spec-compliant handling of HTML <image> and SVG/MathML
 foreign content in the HTML preload scanner. Ships in M155 and can be
 removed in M158. https://crbug.com/40728681

 Used to allow chrome://flags to turn off prerendering. (Without using
 the user-facing preloading settings page to turn off other
 preloading.) See https://crbug.com/1494471.

 It also has some feature params defined throughout the codebase.

 Used to allow prerender cross-origin iframes with an opt-in response
 header.
 https://chromestatus.com/feature/5112398709129216
 https://crbug.com/440387014

 Used to allow prerender activation by form submission.
 See https://crbug.com/346555939.

 When enabled, a text control's cached selection is preserved while the
 control is not focused or has a post-layout selection restore pending,
 instead of being refreshed from the live DOM selection. Kill switch
 for https://crbug.com/40884623. This feature ships in M154 and can be
 removed in M156.

 When enabled, fixes selection jumping when drag-selecting out of
 a float box boundary.
 See https://crbug.com/41340914

 Always allow trust token issuance (so long as the base::Feature
 is enabled). Used for testing; circumvents a runtime check that,
 if this RuntimeEnabledFeature is not present, guarantees the origin
 trial is enabled.

 When enabled, dedicated workers can use profiler API

 Promisify programmatic scroll methods in Element and Window.
 https://crbug.com/41406914

 Expose ProgressEvent in service workers.
 https://xhr.spec.whatwg.org/#interface-progressevent
 https://crbug.com/332663431

 Propagate overscroll-behavior from the root element rather than the
 body element. crbug.com/41453796

 Allowing pseudo-elements to have focus.

 Support hit-testing for ::after, ::before, ::marker
 (e.g. for CSSPseudoElement).

 Support :hover on ::after, ::before, ::marker.

 ChromeStatus: https://chromestatus.com/feature/6194847180128256

 Gives a natively painted input[type=radio] a 50% border radius so that
 box-shadow and outline follow the circle the theme paints instead of
 the square border box. See crbug.com/40877887.

 Sets Range boundaries relative to a sibling node lazily, avoiding the
 O(n) Node::NodeIndex()/NodeTraversal::ChildAt walks so that selectNode()
 is O(1) instead of O(n). See crbug.com/515812864.

 Used as a kill switch in case the rate limiting causes issues.

 Enables support for a 'min' option in ReadableStream BYOBReader.read(),
 allowing callers to specify the minimum number of bytes to be read into
 the buffer before resolving the read request.
 https://chromestatus.com/feature/6396991665602560

 getType() on a ClipboardItem triggers the
 clipboard read operation, implementing lazy loading for clipboard data.
 Chrome status entry - https://chromestatus.com/feature/5203433409871872

 Enables correct reading-flow ordering when slots are involved.
 This will be shipped in M148, and it can be removed in M150.
 See https://issues.chromium.org/issues/452981723.

 Enables caret visibility and keyboard selection/navigation for
 readonly text controls (input and textarea).
 https://issues.chromium.org/issues/40801366

 Shipping in M148, revised in M151, so should be removed around M153.

 If enabled, both Accept-Language HTTP header and JavaScript getter will
 be reduced.

 If enabled, the minor version of the User-Agent string will be reduced.
 This User-Agent Reduction feature has been enabled starting from M101,
 but we still keep this flag for future phase tests.

 Kill switch for https://crbug.com/376516545.
 Releases paint holding (deferred compositor commits) early for pages
 that finish parsing and produce a first paint but never reach First
 Contentful Paint (e.g. background-color only pages).

 This feature acts as a kill switch for ISO-2022-JP auto-detection.
 This will be shipped in M139, and it can be removed in M141.
 See https://chromestatus.com/feature/6576566521561088.

 Optimize ReplaceChildren() to use RemoveChildren() for batch removal
 instead of looping RemoveChild(). This batches style invalidations
 improving performance.

 After paste operation removes the placeholder <br> tag
 that gets inserted in contenteditable as placeholder for newline

 Remove non-allowlisted event interfaces from document.createEvent().
 This was added in M148 and can be removed after M150.
 https://chromestatus.com/feature/5095987863486464
 https://issues.chromium.org/issues/41228793

 See https://issues.chromium.org/issues/40779139

 See https://issues.chromium.org/issues/41311101

 The renderpriority attribute feature.
 https://github.com/WICG/display-locking/blob/main/explainers/update-rendering.md

 When enabled, avoids calling RemoveChildren() in
 ReplaceChildrenWithFragment() if the container is already empty.

 https://crbug.com/567626030

 Kill switch for painting non-SVG replaced normal-flow stacking
 contexts inline with their siblings.
 This was set to experimental due to crbug.com/532229489.

 If enabled, makes the root scrollbars' foreground elements follow the
 browser

 Route matching, @route CSS rule.
 https://chromestatus.com/feature/4771962874363904

 Non-standard RTCConfiguration.iceTransports alias. Off by default
 (alias removed). Enable via Finch to restore if sites break.
 https://crbug.com/488071544