Kill switch to guard additional security checks performed by the browser
process on opaque origins, such as when verifying source origins for
postMessage. See https://crbug.com/40109437.

Warm up a spare renderer after each navigation on Android.

Launches the audio service on the browser startup.

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.

Kill switch for Background Fetch.

Enable using the BackForwardCache.

Allows pages that created a MediaSession service to stay eligible for the
back/forward cache.

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.

If enabled, makes battery saver request render process tuning.

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

When this feature is enabled, private network requests initiated from
non-secure contexts in the public address space  are blocked.

See also:
- https://wicg.github.io/private-network-access/#integration-fetch
- kBlockInsecurePrivateNetworkRequestsFromPrivate
- kBlockInsecurePrivateNetworkRequestsFromUnknown

When this feature is enabled, requests to localhost initiated from non-secure
contexts in the private IP address space are blocked.

See also:
- https://wicg.github.io/private-network-access/#integration-fetch
- kBlockInsecurePrivateNetworkRequests

Enables use of the PrivateNetworkAccessNonSecureContextsAllowed deprecation
trial. This is a necessary yet insufficient condition: documents that wish to
make use of the trial must additionally serve a valid origin trial token.

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

When enabled, mouse user activation will be verified by the browser side.

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): Enable this feature.

This killswitch is distinct from the OT.
It allows us to remotely disable the feature, and get it to stop working even
on sites that are in possession of a valid token. When that happens, all API
calls gated by the killswitch will fail graceully.

If enabled, CSC permissions are sticky - as all other permissions.
If disabled, CSC permissions are scoped to the capture session's duration.

This serves as an overall kill switch to kill CdmStorageDatabase. If
disabled, no operations will be routed through the CdmStorage path, even in
the migration code that lives in MediaLicense code path.
This feature is enabled as default alongside with
kCdmStorageDatabaseMigration enabled by default as to allow for data transfer
from the MediaLicenseDatabase to CdmStorageDatabase to occur. Refer to
go/cdm-storage-migration-details for more details.

This guards between using the MediaLicense code path and the CdmStorage
code path for storing Cdm data. This will be enabled by default as we do not
want the CdmStorageDatabase to be used solely.
Later when the migration is finished, we will remove this flag so that
kCdmStorageDatabase serves as the only flag. Refer to
go/cdm-storage-migration-details for more details.

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

Gate access to cookie deprecation API which allows developers to opt in
server side testing without cookies.
(See https://developer.chrome.com/en/docs/privacy-sandbox/chrome-testing)

Enables Blink cooperative scheduling.

Enables crash reporting via Reporting API.
https://www.w3.org/TR/reporting/#crash-report

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.

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

Enables the DIPS (Detect Incidental Party State) feature.
On by default to allow for collecting metrics. All potentially dangerous
behavior (database persistence, DIPS deletion) will be gated by params.

Whether DIPS deletes Privacy Sandbox data.

Enables HW decode acceleration for WebRTC.

Enables HW encode acceleration for WebRTC.

Enables disconnecting the ExtensionMessagePort when the page using the port
enters BFCache.

Enable drawing under System Bars within DisplayCutout.

Enable establishing the GPU channel early in renderer startup.

Enables canvas 2d methods BeginLayer and EndLayer.

Enables service workers on chrome-untrusted:// urls.

Enables service workers on chrome:// urls.

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 the "Use a different account" button in the FedCM account chooser to
log in to another IDP account, if the IDP opts in.

Enables usage of the FedCM Authz API.

Enables usage of the FedCM ButtonMode feature.
Note that actual exposure of the 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 usage of the FedCM IdP Registration API.

Enables the IDP signin status API for use with FedCM, including avoiding
network requests when not signed in and mismatch handling.
When turned off, Login-Status headers are still parsed and processed
and FedCM mismatch metrics are collected.

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

Enables usage of the FedCM API with multiple identity providers at the same
time.

Enables usage of the FedCM API with the Selective Disclosure API at the same
time.

Enables bypassing the well-known file enforcement.

Enables browser-side focus verification when crossing fenced boundaries.

Enables the Digital Credential API.

Enables scrollers inside Blink to store scroll offsets in fractional
floating-point numbers rather than truncating to integers.

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).

Determines if an extra brand version pair containing possibly escaped double
quotes and escaped backslashed should be added to the Sec-CH-UA header
(activated by kUserAgentClientHint)

Kill switch for the GetInstalledRelatedApps API.

Allow Windows specific implementation for the GetInstalledRelatedApps API.

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 a new Automatic Fullscreen content setting that lets allowlisted
origins use the HTML Fullscreen API without transient activation.
https://chromestatus.com/feature/6218822004768768

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.

Enables experimental JavaScript shared memory features.

Enable lazy initialization of the media controls.

Enables reporting of Cookie Issues for Legacy Technology Report.

Configures whether Blink on Windows 8.0 and below should use out of process
API font fallback calls to retrieve a fallback font family name as opposed to
using a hard-coded font lookup table.

Uses ThreadType::kCompositing for the main thread

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

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

Kill switch for Web Notification content images.

Enables the notification trigger API.

Feature which holdbacks NoStatePrefetch on all surfaces.

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.

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

Whether web apps can run periodic tasks upon network connectivity.

Kill-switch to introduce a compatibility breaking restriction.

Enables Persistent Origin Trials. It causes tokens for an origin to be stored
and persisted for the next navigation. This way, an origin trial can affect
things before receiving the response, for instance it can affect the next
navigation's network request.

If enabled, browser-initiated prefetch is allowed.
Please see crbug.com/40946257 for more details.

If enabled, then an updated prefetch request limit policy will be used that
separates eager and non-eager prefetches, and allows for evictions.

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.

Enables Private Network Access checks for all types of web workers.

This affects initial worker script fetches, fetches initiated by workers
themselves, and service worker update fetches.

The exact checks run are the same as for other document subresources, and
depend on the state of other Private Network Access feature flags:

- kBlockInsecurePrivateNetworkRequests
- kPrivateNetworkAccessSendPreflights
- kPrivateNetworkAccessRespectPreflightResults

Enables Private Network Access checks in warning mode for all types of web
workers.

Does nothing if kPrivateNetworkAccessForWorkers is disabled.

If both this and kPrivateNetworkAccessForWorkers are enabled, then PNA
preflight requests for workers are not required to succeed. If one fails, a
warning is simply displayed in DevTools.

Enables Private Network Access checks for navigations.

The exact checks run are the same as for document subresources, and depend on
the state of other Private Network Access feature flags:
- kBlockInsecurePrivateNetworkRequests
- kPrivateNetworkAccessSendPreflights
- kPrivateNetworkAccessRespectPreflightResults

Enables Private Network Access checks in warning mode for navigations.

Does nothing if kPrivateNetworkAccessForNavigations is disabled.

If both this and kPrivateNetworkAccessForNavigations are enabled, then PNA
preflight requests for navigations are not required to succeed. If
one fails, a warning is simply displayed in DevTools.

Requires that CORS preflight requests succeed before sending private network
requests. This flag implies kPrivateNetworkAccessSendPreflights.
See: https://wicg.github.io/private-network-access/#cors-preflight

Enables sending CORS preflight requests ahead of private network requests.
See: https://wicg.github.io/private-network-access/#cors-preflight

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.

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

When enabled, queues navigations instead of cancelling the previous
navigation if the previous navigation is already waiting for commit.
See https://crbug.com/838348 and https://crbug.com/1220337.

When enabled, sends SubresourceResponseStarted IPC only when the user has
allowed any HTTPS-related warning exceptions. From field data, (see
SSL.Experimental.SubresourceResponse), ~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.

Enable using the RenderDocument.

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

Set a tri-state priority on v8 isolates reflecting the renderer priority.

Reuse compositor instances with RenderDocument

Enables retrying to obtain list of available cameras after restarting the
video capture service if a previous attempt failed, which could be caused
by a service crash.

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.

Enables ServiceWorker static routing API.
https://github.com/WICG/service-worker-static-routing-api

Run video capture service in the Browser process as opposed to a dedicated
utility process.
Camera requests from Lacros are forwarded to Ash via a Mojo connection
established through cros-api. Since cros-api isn't available in utility
processes, Lacros's video capture service has to run within the browser
process.

Update scheduler settings using resourced on ChromeOS.

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.

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

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

If enabled, SharedArrayBuffer is present and can be transferred on desktop
platforms. This flag is used only as a "kill switch" as we migrate towards
requiring 'crossOriginIsolated'.

Kill switch for creating first-party StorageKeys in
RenderFrameHostImpl::CalculateStorageKey for frames with extension URLs.

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

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.

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

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

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.

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

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.

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).

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

Allows user activation propagation to all frames having the same origin as
the activation notifier frame.  This is an intermediate measure before we
have an iframe attribute to declaratively allow user activation propagation
to subframes.

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

Enables future V8 VM features

Enables per PWA System Media Controls. Only supported on Windows and macOS.

Enable WebAssembly baseline compilation (Liftoff).

Enable WebAssembly JSPI.

Enable WebAssembly lazy compilation (JIT on first call).

Enable WebAssembly Memory64.

Enable WebAssembly tiering (Liftoff -> TurboFan).

Enable WebAssembly trap handler.

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.

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 code caching for scripts used on WebUI pages.

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

Controls whether the WebXR Device API is enabled.

Enable the navigator.permissions API.
Used for launch in WebView, but exposed in content to map to runtime-enabled
feature.

Create the spare renderer in DidStopLoading rather than in

The delay for creating the Android spare renderer in

BackForwardCache is disabled on low memory devices. The threshold is defined
via a field trial param: "memory_threshold_for_back_forward_cache_in_mb"

If enabled, makes battery saver request render process tuning.

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

When this feature is enabled, private network requests initiated from
non-secure contexts in the public address space  are blocked.

See also:
- https://wicg.github.io/private-network-access/#integration-fetch
- kBlockInsecurePrivateNetworkRequestsFromPrivate
- kBlockInsecurePrivateNetworkRequestsFromUnknown

Enables use of the PrivateNetworkAccessNonSecureContextsAllowed deprecation

Broker file operations on disk cache in the Network Service.

When enabled, mouse user activation will be verified by the browser side.

Allows pages with cache-control:no-store to enter the back/forward cache.

This serves as an overall kill switch to kill CdmStorageDatabase. If
disabled, no operations will be routed through the CdmStorage path, even in
the migration code that lives in MediaLicense code path.
This feature is enabled as default alongside with

Set whether Ads APIs should be disabled for third-party cookie deprecation.

/name=/
/default_value=/

When enabled, the browser will create the render process if necessary even

Controls whether the Digital Goods API is enabled.

Sets how long DIPS maintains interactions and Web Authn Assertions (WAA) for
a site.

Sets how long DIPS maintains interactions and Web Authn Assertions (WAA) for
a site.

If a site in the DIPS database has an interaction or WAA within the grace
period a DIPS-triggering action, then that action and all ensuing actions are

Sets how long DIPS maintains interactions and Web Authn Assertions (WAA) for
a site.

If a site in the DIPS database has an interaction or WAA within the grace
period a DIPS-triggering action, then that action and all ensuing actions are
protected from DIPS clearing until the interaction and WAA "expire" as set
by this param.
NOTE: Updating this param name (to reflect WAA) is deemed unnecessary as far

Sets the actions which will trigger DIPS clearing for a site. The default is
to set to kBounce, but can be overridden by Finch experiment groups,
command-line flags, or chrome flags.

Note: Maintain a matching nomenclature of the options with the feature flag

Denotes the length of a time interval within which any client-side redirect
is viewed as a bounce (provided all other criteria are equally met). The
interval starts every time a page finishes a navigation (a.k.a. a commit is
registered).

Puts network quality estimate related Web APIs in the holdback mode. When the

Allow Windows specific implementation for the GetInstalledRelatedApps API.

Enable support for isolated web apps. This will guard features like serving

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

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

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).

Enables Private Network Access checks in warning mode for all types of web
workers.

Does nothing if kPrivateNetworkAccessForWorkers is disabled.

Enables Private Network Access checks in warning mode for all types of web
workers.

Does nothing if kPrivateNetworkAccessForWorkers is disabled.

If both this and kPrivateNetworkAccessForWorkers are enabled, then PNA
preflight requests for workers are not required to succeed. If one fails, a
warning is simply displayed in DevTools.

Enables Private Network Access checks for navigations.

The exact checks run are the same as for document subresources, and depend on
the state of other Private Network Access feature flags:
- kBlockInsecurePrivateNetworkRequests
- kPrivateNetworkAccessSendPreflights

Enables Private Network Access checks in warning mode for navigations.

Does nothing if kPrivateNetworkAccessForNavigations is disabled.

When enabled, sends SubresourceResponseStarted IPC only when the user has

When enabled, sends SubresourceResponseStarted IPC only when the user has
allowed any HTTPS-related warning exceptions. From field data, (see
SSL.Experimental.SubresourceResponse), ~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

RenderDocument:

Currently, a RenderFrameHost represents neither a frame nor a document, but a
frame in a given process. A new one is created after a different-process
navigation. The goal of RenderDocument is to get a new one for each document

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

Specifies the threshold for kProcessPerSiteUpToMainFrameThreshold feature.

When kProcessPerSiteUpToMainFrameThreshold is enabled, allows process reuse
even when DevTools was ever attached. This allows developers to test the

Run video capture service in the Browser process as opposed to a dedicated
utility process.
Camera requests from Lacros are forwarded to Ash via a Mojo connection
established through cros-api. Since cros-api isn't available in utility

Used to control whether to remove the restriction that PaymentCredential in

If enabled, SharedArrayBuffer is present and can be transferred on desktop
platforms. This flag is used only as a "kill switch" as we migrate towards
requiring 'crossOriginIsolated'.

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

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.

Enables comparing browser and renderer's DidCommitProvisionalLoadParams in

Enables future V8 VM features

Enable WebAssembly lazy compilation (JIT on first call).

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,

When enabled, includes the ACTION_LONG_CLICK action to all relevant nodes in
the web contents accessibility tree.

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 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.

 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

 If enabled, blink will not set the autofill state of a field after JS
 modifies its value, and will instead leave it to the WebAutofillClient to
 take care of the state setting.
 This feature should be enabled with
 autofill::features::kAutofillFixCachingOnJavaScriptChanges.

 See https://crbug.com/40150299, and
 https://github.com/whatwg/dom/issues/1255.

 This is not going into origin trial, "origin_trial_feature_name" is
 required for using the "implied_by" behaviour.

 AudioContext.playoutStats interface.
 https://chromestatus.com/feature/5172818344148992

 Killswitch. Remove after 1 or 2 stable releases.

 Killswitch. Remove after 1 or 2 stable releases.

 Enables Permissions API query support for Automatic Fullscreen.
 https://chromestatus.com/feature/6218822004768768

 If enabled, lazy loaded images can be auto sized if the sizes
 attribute is missing or set to auto.

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

 Used to enable Blink side of features flags for Default Nav Transition.

 There are two different code changes guarded by this feature. Both
 are about triggering a beforeunload cancel dialog and need adoption
 from developers.
 1. If event.preventDefault() is called, prompt cancel dialog.
 2. If event.returnValue is the empty string, do not prompt cancel dialog.

 crbug.com/1147998: 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.

 Full support for box-decoration-break, including block fragmentation,
 not just -webkit-box-decoration-break with inlines at line breaks.

 crbug.com/41485013

 crbug.com/41485013

 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.

 https://github.com/Igalia/explainers/blob/main/canvas-formatted-text/html-in-canvas.md

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

 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

 https://www.w3.org/TR/cssom-view-1/#dom-document-caretpositionfrompoint

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

 https://html.spec.whatwg.org/multipage/interaction.html#close-requests-and-close-watchers

 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

 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.

 Controls whether form elements may delay editor creation until layout.
 This is a kill switch. See https://crbug.com/325613706 for details.

 Allow WebAuthn relying parties to report information about existing
 credentials back to credential storage providers.

 CSS attr() function that accepts not only string types
 and can be used in all properties.
 https://drafts.csswg.org/css-values-4/#attr-notation

 Allows positioning a positioned element relative to another one.
 https://drafts.csswg.org/css-anchor-1/

 Support for the anchor-scope property.
 https://drafts.csswg.org/css-anchor-position-1/#anchor-scope

 Whether  values are allowed as counter style 

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

 https://chromestatus.com/feature/5125388091260928

 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/5196713071738880
 Shipped in M129.  Should be safe to remove the flag a bit after
 M129 has shipped to stable.

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

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

 This flag controls whether the deprecated :--foo syntax is enabled. It
 is being replaced by :state(foo), which is controlled by the
 CSSCustomStateNewSyntax flag.
 TODO(crbug.com/1514397): Remove this when the feature is fully launched.

 This flag controls whether the :state(foo) pseudo-class for custom
 elements is enabled. It is a rename of :--foo, which is being
 deprecated and is controlled by the CSSCustomStateDeprecatedSyntax
 flag.
 TODO(crbug.com/1514397): Remove this when the deprecation is done.

 crbug.com/345562934

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

 Spec change to search for container query and container units up the
 flat tree instead of the shadow-including ancestors.

 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

 For the position-try-fallbacks property, replaces the inset-area()
 syntax with just <'inset-area'>.

 https://chromestatus.com/feature/6289894144212992

 Flag so that we can Finch the effects of our SIMD fast-path for
 skipping lazily-parsed CSS declaration blocks faster.

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

 position-try-options has been renamed to position-try-fallbacks.

 position-try-options has been renamed to position-try-fallbacks. Will
 be removed, but kept as a surrogate for now.

 Support the position-try-order property.
 https://drafts.csswg.org/css-anchor-position-1/#position-try-order-property

 Support the position-visibility property for anchor positioning.
 https://drafts.csswg.org/css-anchor-position-1/#position-visibility
 TODO(crbug.com/332933527): Support anchors-valid and no-overflow. For
 now, this only supports always and anchors-visible.

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

 Enables the :open and :closed pseudo-selectors.
 https://chromestatus.com/feature/5085419215781888

 When an audio, video, or similar resource is "playing"
 or "paused".
 https://www.w3.org/TR/selectors-4/#video-state

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

 TODO(crbug.com/40932006): Non-standard 'reading-flow' keyword
 for reading of grid and flexbox items.
 https://drafts.csswg.org/css-display-4/#reading-flow

 https://drafts.csswg.org/css-color-5/#relative-colors

 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.

 crbug.com/40249572

 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/#snap-events

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

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

 Flag for supporting scroll-state() and container-type: scroll-state
 Implied by supporting at least one of the scroll-state query features.

 Explainer: https://drafts.csswg.org/css-values/#round-func

 The AccentColor And AccentColorText CSS system color keywords

 crbug.com/1463890: CSS text-autospace property

 TODO(https://crbug.com/1411581):
 https://w3c.github.io/csswg-drafts/css-inline-3/#propdef-leading-trim

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

 Makes the transition shorthand omit longhands which have initial
 values as per a standards discussion.
 Shipped in M127, should be safe to remove in M132.
 https://issues.chromium.org/issues/41487057
 https://github.com/web-platform-tests/wpt/issues/43574

 Support for tree-scoped [1] timeline names (e.g. produced by
 scroll-timeline).

 [1] https://drafts.csswg.org/css-scoping-1/#shadow-names

 Support for user-select:contain.

 https://chromestatus.com/feature/5064894363992064

 https://html.spec.whatwg.org/#dom-customelementregistry-getname

 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

 This feature makes the 
 element close properly when its "open"
 attribute is removed. https://github.com/whatwg/html/issues/5802

 Shipping in M121.  Flag should be removed after M121 has been
 shipping to stable for a few weeks.

 Disables anti-aliasing for the Ahem font. Anti-aliasing this font breaks a
 significant amount of WPT test expectations.

 This feature will represent the extension of a deprecation trial that
 allows first parties to temporarily use unpartitioned storage in embeds
 loaded on their site. It replaces an old DT named
 DisableThirdPartyStoragePartitioning which expired in M126.

 Dispatch beforeinput event for number input according to the spec:
 https://w3c.github.io/uievents/#event-type-beforeinput

 This is landing in M127, and can be removed in M129.

 When disabled, beforeinput event will not be fired when spin button
 interactions like ArrowUp, ArrowDown and mouse click on spin button
 are made on number input.

 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

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

 Makes document's fallback base URL use about:blank instead of the base
 URL of whatever execution context created it in order to match the
 HTML spec and the behavior already shipped in all other browsers. This
 behavior is reflected by document.baseURI.

 This is a performance fix for  popups which was enabled by
 default in M128.

 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
 IncludeJSCallStacksInCrashReports. https://chromestatus.com/feature/4731248572628992

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

 https://chromestatus.com/feature/5113053598711808

 When enabled, this allows users of DOMParser to do:
 (new DOMParser()).parseFromString(...,{includeShadowRoots:true}).
 This is being deprecated and removed: crbug.com/329330085.
 The fieldtrial_testing_config currently disables this feature for tests.

 Controls whether DOMParser.parseFromString() attempts to use the
 html fast path parser. This flag is to be used as a killswitch in case
 of any issues.

 Shipping in M121, so should be safe to remove in M126.

 Drop the entire URL as plaintext in plaintext only editable position.
 Fix for https://crbug.com/40895258. This change is landing in M127 and
 the flag can be removed in M129 in case of no issues.

 Dynamically change the safe area insets based on the bottom browser
 controls visibility.

 Dynamically change the safe area insets as browser controls scrolls.

 This is the "old" version of getInnerHTML() used for declarative shadow
 DOM, and this version is deprecated. The replacement is called
 getHTML() and it shipped in M125.

 Experiment with preventing some instances of mutation XSS
 by escaping "<" and ">" in attribute values.
 See: crbug.com/1175016

 crbug.com/333630754

 Kill switch.

 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.

 The Blink runtime-enabled feature name for the API's IDL.

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

 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.

 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.

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

 Permit trusted signals to come cross-origin, subject to CORS on the
 trusted server side and opt-in on the worklet script side.

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

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

 Kill switch for crbug.com/1420810 fix
 TODO(xiaochengh): Remove after M122.

 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

 TODO(crbug.com/1419161): Remove this feature after M113 has been stable
 for a few weeks or more. This is a kill switch that, when enabled, goes
 back to the old behavior, which was to restore the state for 
 and  even when they had autocomplete=off.

 TODO(crbug.com/1432009) Allow form controls with vertical writing mode
 to have direction affect the flow of the control.

 Bug fix for crbug.com/1429585

 Updates the hanging behavior of preserved whitespace at the end of a
 line to not depend on text-align. This flag is to be used as a
 killswitch in case of any issues.
 https://github.com/w3c/csswg-drafts/issues/3440
 crbug.com/1363901

 The anchor attribute, supported by both anchor positioning and the
 popover API.

 Adds support for the experimental interesttarget
 attributes, as specified in the open-ui "Interest Invokers" explainer.
 https://open-ui.org/components/interest-invokers.explainer/

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

 Adds support for the experimental invoketarget and invokeaction
 attributes, as specified in the open-ui "Invokers" explainer.
 https://open-ui.org/components/invokers.explainer/

 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.

 A flag to control the popovertargetaction=hover behavior,
 and associated CSS properties.

 TODO(crbug.com/1416284): Enables popover=hint functionality.

 http://crbug.com/1478969
 https://github.com/whatwg/html/pull/9538
 https://chromestatus.com/feature/6560361081995264
 Enabled by default in M123, should be safe to remove in M127

 According to spec, text transforms should not affect the content
 of plain text copy and paste -
 https://www.w3.org/TR/css-text-3/#text-transform

 This change, although technically breaking, is expected to be fully web-compatible
 due to how import attributes are currently used in the ecosystem. However, this is
 a killswitch just in case. This can be removed once it ships to stable and no
 regressions are reported.

 ImprovedXMLErrors tweaks the way that we emit XML parsing errors in
 some cases in order to comply with upstream changes to libxml.
 Shipping in M123, so should be safe to remove in M126.

 When enabled, every traversable mainframe same-doc navigation will
 increment the viz::LocalSurfaceId from the impl thread.

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

 crbug.com/343749045

 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.

 Kill switch for https://crbug.com/40877677

 If enabled, the input stepDown(n) and stepUp(n) methods will check
 that the current value is valid before applying step 10 of their
 specified algorithms.
 This flag can be removed in M128 assuming no issues.

 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

 crbug.com/1420675

 If enabled, IntersectionObserverScrollMargin will be parsed.

 Allows :target to match elements even after they are removed and
 reattached to the document. Enabled in M128, should be safe to remove
 in M133.

 TODO(crbug.com/40113891): This feature allows scrollers to be
 keyboard focusable by default.

 TODO(crbug.com/40113891): Disables KeyboardFocusableScrollers.
 This feature only takes effect if KeyboardFocusableScrollers is
 enabled. It will overwrite the behavior and not allow scrollers to be
 keyboard focusable by default.

 This is a killswitch for a bug fix that is shipping in M128.

 This feature makes HTMLLabelElement::DefaultEventHandler always call
 HTMLElement::DefaultEventHandler instead of only doing so
 conditionally. Shipping in M123 so should be safe to remove in M127.

 If enabled, the lazy load image observer will use a scroll margin in
 its init dictionary instead of a root margin.

 If enabled, the lazy load iframe observer will use a scroll margin in
 its init dictionary instead of a root margin.

 Enables long aniamtion frames as a performance API (the
 "long-animation-frame" timeline entry)

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

 Use LongAnimationFrameMonitor to emit longtask entries

 Set to reflect the MediaCastOverlayButton feature.

 Set to reflect the kMediaEngagementBypassAutoplayPolicies feature.

 This uses media::VideoEncoder implementation in MediaRecorder API
 instead of using MediaRecorder own video encoder implementation.

 This is a killswitch for  no
 longer accepting fractions, landed around M125.
 It can be removed in M127 if there are no problems.

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

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

 crbug.com/269917: Make mouse event targets agnostic to mousedown event
 cancellation when the pointer is dragged out of an iframe.

 crbug.com/40078978: Allow mouse-drag text selection even when mousemove
 event is cancelled.

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

 crbug.com/1446498: This feature is being used for the deprecation of
 Mutation Events.

 crbug.com/1446498: This feature is just used as part of an "early trial"
 of disabling Mutation Events in Canary/Dev/Beta. If this feature is
 enabled and MutationEvents is disabled, then a special console error
 message is used to give more information.

 This is a killswitch for the changed behavior of
 CompositorFilterOperations::MapRect() for crbug.com/329235801.
 Can be removed in M127 if things are stable.

 This is a killswitch for the behavior of Element::GetFocusableArea
 on delegatesFocus shadow hosts. This flag can be removed in M127 if
 things are stable.

 Doesn't increase the end offset on getting the range for a new line
 character. See https://crbug.com/326888905

 Makes enter/leave Mouse and Pointer Events non-composed as per
 corresponding specifications.

 Doesn't insert empty blockquotes on outdenting a blockquote. See
 https://crbug.com/323960902

 Input event data for textarea should not be null for certain
 inputTypes.
 https://issues.chromium.org/issues/40737336

 TODO(crbug.com/924486): This feature enables the deprecated values
 inner-spin-button, push-button, searchfield-cancel-button,
 slider-horizontal, square-button. Disable this feature to stop
 parsing or allowing these values.
 This feature is disabled in fieldtrial testing config because we are
 testing the deprecation via Finch.
 https://drafts.csswg.org/css-ui-4/#appearance-switching

 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

 NotificationContentImage is not available in all platforms
 The Notification Center on Mac OS X does not support content images.

 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.

 The following are developer opt-outs and opt-ins for page freezing. If
 neither is specified then heuristics will be applied to determine whether
 the page is eligible.

 Support for page margin boxes.
 https://www.w3.org/TR/css-page-3/#margin-boxes

 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.

 https://chromestatus.com/feature/5198846820352000

 PaymentRequest is enabled by default on Android

 Enables performance.mark('mark_feature_usage'): crbug.com/1517170

 Tracking bug for the implementation: https://crbug.com/1462930

 This is a reverse OT used for a phased deprecation.
 https://crbug.com/918374

 Coalesced/predicted event targets in untrusted events.
 See https://crbug.com/353538500

 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.

 This feature is deprecated and we are evangelizing affected sites.
 A deprecation trial is underway, starting in M125.
 See https://crbug.com/40352864 for current status

 Attempt to set up paint properties for ancestors when pre-painting a
 missed descendant, so that paint effects like transforms aren't lost.

 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.

 When enabled, styling for the content within heading will be
 preserved after merge.

 Controls whether filtering IDs can be specified for Private Aggregation
 contributions. If disabled, any IDs will be ignored.

 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.

 Protected memory varariant of the sample API for testing integration with
 the Origin Trials Framework. This is used only in unit tests.
 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.
 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.

 If enabled, the Accept-Language header will be reduced.

 If enabled, the deviceModel will be reduced to "K" and the
 androidVersion will be reduced to a static "10" string in android
 User-Agent string.

 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.

 If enabled, the platform and oscpu of the User-Agent string will be
 reduced.

 Remove a node if it's selected fully even though it has children. See
 https://crbug.com/331074432

 See https://issues.chromium.org/issues/41311101

 See https://github.com/whatwg/html/issues/10034

 The renderpriority attribute feature.
 https://github.com/WICG/display-locking/blob/main/explainers/update-rendering.md

 TODO(crbug.com/1500633): Remove this flag when the new CursorAnchorInfo
 mojo pipe is launched.

 New behavior when line breaker rewinds floats. crbug.com/1499290

 Enables the use of jitterBufferTarget attribute in WebRTC.
 Spec: https://w3c.github.io/webrtc-extensions/#dom-rtcrtpreceiver-jitterbuffertarget

 Legacy callback-based getStats() has limited availability unless this
 Deprecation Trial is enabled.
 TODO(https://crbug.com/822696): Remove when origin trial ends.

 Enables the use of |RTCRtpEncodingParameters.codec|

 Enables the use of |RTCRtpTransceiver::getHeaderExtensionsToNegotiate|,
 |RTCRtpTransceiver::setHeaderExtensionsToNegotiate|, and
 |RTCRtpTransceiver::getNegotiatedHeaderExtensions|.

 Enables the use of SVC scalability mode in WebRTC.
 Spec: https://w3c.github.io/webrtc-svc/

 crbug.com/336592423

 crbug.com/324111880

 crbug.com/340041662

 crbug.com/324111880

 Runs a microtask checkpoint before creating custom elements in
 XMLDocumentParser. Should be safe to remove after M125

 https://wicg.github.io/webcomponents/proposals/Scoped-Custom-Element-Registries

 WebSpeech API with both speech recognition and synthesis functionality
 is not fully enabled on all platforms.

 Killswitch. Remove after M126 or M127 stable.

 Separate flag for crbug.com/1426506 (getCurrentTime API change) which
 is expected to land after the initial launch of ScrollTimeline.

 Implements documentElement.scrollTop/Left and bodyElement.scrollTop/Left
 as per the spec, matching other Web engines.

 This flag can't be removed until the Android min SDK version is 28
 (i.e., 'P') or later.  See AWSettings.setScrollTopLeftInteropEnabled
 and its caller.

 SecurePaymentConfirmation has shipped on some platforms, but its
 availability is controlled by the browser process (via the
 SecurePaymentConfirmationBrowser feature), as it requires browser
 support to function. See //content/public/common/content_features.cc

 The status is set to 'test' here to enable some WPT tests that only
 require blink-side support to function.

 Implement Selection API across shadow DOM
 See https://w3c.github.io/selection-api/

 Maintain author-defined ::selection highlight colors, even if they
 match the text color.

 Sets the minimum target size of  in  to 24x24 CSS
 pixels to meet Accessibility standards.
 https://www.w3.org/WAI/WCAG22/Understanding/target-size-minimum.html

 Makes the HTML parser allow most tags inside of  instead of
 only , , and 
.
 https://github.com/whatwg/html/issues/10310

 If enabled, the type to search in a select element will ignore accents.
 This should land in M128, and can be cleaned up (assuming no problems)
 after M130.
 https://crbug.com/349089079

 crbug.com/329677645

 Makes select.showPicker() and input.showPicker() consume user
 activation in order to prevent abuse. Shipping in M127, should be safe
 to remove in M131.

 crbug.com/40501131

 If enabled, HTMLPreloadScanner will be skipped.

 Skips the browser touch event filter, ensuring that events that reach
 the queue and would otherwise be filtered out will instead be passed
 onto the renderer compositor process as long as the page hasn't timed
 out. If skip_filtering_process is browser_and_renderer, also skip the
 renderer cc touch event filter, ensuring that events will be passed
 onto the renderer main thread.

 Skips calling update type if the HTMLInputElement is created by parser.
 This flag can be removed in M127 if no issues reported.

 Used to enable the code for detecting soft navigations through task
 attribution. Set to stable as this generates an enabled-by-default
 base::Feature for a field-trial remote shutoff. Needs to be a runtime
 feature so that the Soft Navigation Heuristics Origin Trial can depend
 on it.

 This feature exists solely to be the target of implied_by for features
 that are part of this trial but which may also be enabled another way.
 Otherwise, runtime-enabled features can be added to the origin trial
 with the following:
   origin_trial_feature_name: "SpeculationRulesPrefetchFuture",
   origin_trial_allows_third_party: true,

 Used as argument in attribute of stable-release functions/interfaces
 where a runtime-enabled feature name is required for correct IDL syntax.
 This is a global flag; do not change its status.

 See https://github.com/w3c/csswg-drafts/issues/9398

 Gates the durability() method on a storage bucket and the property in
 the options struct.

 Gates the locks() method on a storage bucket.

 Adds the appearance:base-select CSS value which makes 
 rendering using alternate content in the UA shadowroot which is
 stylable.

 Feature for optimizing SVG transform changes. This is a kill switch in
 case we encounter issues with these optimizations.

 For unit tests.
 This is for testing copied_from_base_feature_if.
 This is set in base/test/test_suite.cc.

 For unit tests.

 For unit tests.

 For unit tests.

 For unit tests.

 For unit tests.

 For unit tests.

 crbug.com/331680200

 This is a kill switch for the fix to crbug.com/333940413. It landed
 in M126, and can be removed if all is well by M128.

 crbug.com/1008951

 crbug.com/325517313

 New implementation of text-size-adjust that applies during style rather
 than via the text autosizer. This also includes changes such as
 directly using percentage values without heuristics, and fully
 disabling automatic size adjustments when non-auto values are used.
 See: https://crbug.com/340389272.

 Support for the timeline-scope property.

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

 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).

 This feature makes touch dragging to occur at the short-press gesture,
 which occurs right before the long-press gesture.  This feature assumes
 that TouchDragAndContextMenu is enabled.

 Many websites disable mouse support when touch APIs are available.  We'd
 like to enable this always but can't until more websites fix this bug.
 Chromium sets this conditionally (eg. based on the presence of a
 touchscreen) in ApplyWebPreferences. "Touch events" themselves are always
 enabled since they're a feature always supported by Chrome.

 Set to reflect the kTouchTextEditingRedesign feature.

 This is conditionally set if the platform supports translation.

 Unblock queued blocking touchmove after the main thread handles the
 touchstart and the first touchmove and they didn't call
 preventDefault(), instead of waiting for the browser to send
 touchscrollstarted.

 Skip CSS animation events on unowned CSS animations:
 https://drafts.csswg.org/css-animations-2/#event-dispatch

 This is a reverse OT used for a phased deprecation, on desktop
 https://crbug.com/1071424

 Enables using policy-controlled feature "usb-unrestricted" to allow
 isolated context to access protected USB interface classes and to
 bypass the USB blocklist.

 This flag makes IDL reflected attributes with the "URL" IDL attribute
 return the original string of the attribute when a complete URL can't
 be created instead of an empty string.

 Kill switch for the regexp flag update from "u" to "v".

 Makes root scrollbars follow the preferred color scheme by default.
 https://chromestatus.com/feature/5089486318075904

 Whether a video element should automatically play fullscreen unless
 'playsinline' is set.

 If enabled, ViewTransition API is supported for navigations including
 cross-document transitions.
 See https://drafts.csswg.org/css-view-transitions-1/.

 https://chromestatus.com/feature/5089552511533056

 The "WakeLock" feature was originally implied_by "ScreenWakeLock" and
 "SystemWakeLock". The former was removed after being promoted to
 stable, but we need to keep this feature around for code and IDLs that
 should work with both screen and system wake locks.

 When enabled, this will issue a warning to the console any time
 rendering is forced withing content-visibility subtrees (both
 content-visibility: auto and content-visibility: hidden).

 This is not going into origin trial, "origin_trial_feature_name" is
 required for using the "implied_by" behaviour.

 This flag enables the Manifest parser to handle URL Handlers.
 Also enabled when blink::features::kWebAppEnableUrlHandlers is
 overridden on the command line (or via chrome://flags).

 WebAssembly JS Promise Integration,
 https://github.com/WebAssembly/js-promise-integration/blob/main/proposals/js-promise-integration

 WebAuth is disabled on Android versions prior to N (7.0) due to lack of
 supporting APIs, see runtime_features.cc.

 When enabled adds the authenticator attachment used for registration and
 authentication to the public key credential response.

 https://w3c.github.io/webauthn/#dom-publickeycredential-tojson
 https://w3c.github.io/webauthn/#sctn-parseCreationOptionsFromJSON
 https://w3c.github.io/webauthn/#sctn-parseRequestOptionsFromJSON

 https://w3c.github.io/webauthn/#prf-extension

 https://w3c.github.io/webauthn/#sctn-supplemental-public-keys-extension

 WebBluetooth is enabled by default on Android, ChromeOS, macOS and
 Windows.

 Draft WebGL extensions are deliberately not enabled by experimental web
 platform features.

 WebGPU developer features are deliberately not enabled by experimental
 web platform features.

 WebGPU experimental features are meant for features that would
 eventually land in the WebGPU spec.

 Using subgroup related features in WebGPU.
 https://chromestatus.com/feature/5126409856221184

 It is only enabled in extension environment for now.

 Kill switch for making BigInt handling in WebIDL use ToBigInt.

 https://wicg.github.io/web-preferences-api/

 WebShare is enabled by default on Android.

 Note: enabling this without setting WebTransportCongestionControl to
 either BBRv1 or BBRv2 will produce poor bandwidth estimates.

 It is only enabled in extension environment for now.

 If enabled, window.default[Ss]tatus will be supported. This is disabled
 by default, and is here to allow this behavior to be re-enabled via Finch
 in case of problems. This flag should be removed by Q1 2023, assuming
 no problems are encountered.

 Allows sites to request fullscreen when the set of screens change.

 Allows browser-providers writing suggestions to be turned on/off
 through the attribute.
 https://chromestatus.com/feature/5153375153029120

 Flag guard for change to XML parser to merge adjacent CDATA sections.
 See https://crrev.com/c/4790343.

 Flag to guard fix for https://crbug.com/331970402.  Should be removed
 after M125 is stable.

 If enabled, the getDisplayMedia() family of APIs will ask for NV12
 frames, which should trigger a zero-copy path in the tab capture code.