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.

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

Enables the caret browsing a11y feature - can use arrow keys to navigate
through web pages.

DevTools frontend for Android.

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.

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

Warm up a spare renderer after each navigation on Android.

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.

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.

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 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

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

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.

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.

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)

Kill switch for Cookie Deprecation labels, also gated on
kCookieDeprecationFacilitatedTesting.

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 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.

When enabled, the DevTools Privacy UI is displayed.

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).

Enables Bounce Tracking Mitigations for Dual Use sites.

Enables HW decode acceleration for WebRTC.

Enables HW encode acceleration for WebRTC.

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

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

Enable drawing under System Bars within DisplayCutout.

Enable establishing the GPU channel early in renderer startup.

Enables canvas 2d methods BeginLayer and EndLayer.

Enables javaless renderers.

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

Enables service workers on chrome:// urls.

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

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.

Support usernames and phone numbers to identify users, instead of
(or in addition to) names and emails.

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

Enables usage of the FedCM Delegation API.

Enables the spec-compliant 'error' attribute in IdentityCredentialError while
deprecating the legacy 'code' attribute.

Enables usage of the FedCM IdP Registration API.

For cross-site iframes, sends the top-level origin to the IDP and parses
an optional returned boolean indicating whether it is part of the same
client to allow for UI decisions based on the boolean.

Enables Lightweight FedCM Mode

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

Enables Nonce usage in Params

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.

Enables browser-side focus verification when crossing fenced boundaries.

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 Digital Credential API.

Enables the Digital Credentials Creation 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).

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

See crbug.com/359623664

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

Kill switch for the GetInstalledRelatedApps API.

Allow Windows specific implementation for the GetInstalledRelatedApps API.

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".

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).

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.

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

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.

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.

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

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).

Partitioned Popins must have a Popin-Policy in their top-frame HTTP Response
that permits the opener origin. This feature disables that check for purposes
of testing only, this must never be enabled by default in any context.
See https://explainers-by-googlers.github.io/partitioned-popins/

Enables additional ChildProcessSecurityPolicy enforcements for PDF renderer
processes, including blocking storage and cookie access for them.

TODO(https://crbug.com/40205612): Remove this kill switch once the PDF
enforcements are verified not to cause problems.

Whether web apps can run periodic tasks upon network connectivity.

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

If explicitly disabled, prefetch proxy is not used.

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

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

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

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.

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

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

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, ~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.

Feature that stops broadcasting the history index and length when
CreateRenderViewForRenderManager() is invoked, and instead passes the
information in the CreateViewParams, saving some IPC calls.

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.

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 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.

crbug.com/374606637: When this is enabled, race-network-and-fetch-hander will
prioritize the response processing for the network request over the
processing for the fetch handler.

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

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.

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

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

A feature to enabled updating installed PWAs more predictably by considering
changes in icon urls.

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.

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

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.

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

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.

When enabled, RenderWidgetHost in BFCache doesn't contribute to the priority
of the renderer process.

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).

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.

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

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

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.

Enables future V8 VM features

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

Enable WebAssembly baseline compilation (Liftoff).

Enables WebAssembly Shared-Everything Threads.

Enable WebAssembly lazy compilation (JIT on first call).

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.

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

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

Apply PrefetchPriority::kHighest for Webview Prefetch API.

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.

Sets IO threads to kInteractive all the time.

Boosts IO threads and Browser main to kInteractive during input scenarios.

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.

The delay for creating the Android spare renderer in

The delay for creating the Android spare renderer in
SpareRenderProcessHostManager::PrepareForFutureRequests.
The parameter will not be effective if
spare_renderer_creation_after_stop_loading is enabled.
Since the function is called during loading, a delay is introduced to avoid

The timeout for the created spare renderer after each navigation on Android.
The created renderer will be destroyed after the timeout.
A negative value indicates that no timeout will be set for the spare

Kill the spare renderer when the browser goes to the background to free
resources.

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

"BackForwardCacheMemoryControls" is checked before "BackForwardCache". It

"BackForwardCacheMemoryControls" is checked before "BackForwardCache". It
means the low memory devices will activate neither the control group nor the
experimental group of the BackForwardCache field trial.

BackForwardCacheMemoryControls is enabled only on Android to disable

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

Broker file operations on disk cache in the Network Service.

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

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

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

Enables HW decode acceleration for WebRTC.

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

When this feature is enabled, partial storage cleanup will be

Enables javaless renderers.

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

Enables the spec-compliant 'error' attribute in IdentityCredentialError while

This is a kill switch for focusing the RenderWidgetHostViewAndroid on
ActionDown on every touch sequence if not focused already, please see
crbug.com/381820236. The root view, RWHVA, is always focused in Chrome,

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

If enabled, the feature parameter allows all the prerender hosts for
DSE search results to be reused.

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

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.

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

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.

Enables Private Network Access checks for navigations.

The exact checks run are the same as for document subresources, and depend on

Enables Private Network Access checks in warning mode for navigations.

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

When enabled, ProcessSelectionDeferringConditions will be run. This allows

When enabled, queues navigations instead of cancelling the previous
navigation if the previous navigation is already waiting for commit.

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 a Web application is video-capturing a tab, it can use the Region
Capture API to crop the resulting video.

RenderDocument:

Currently, a RenderFrameHost represents neither a frame nor a document, but a

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
instead.

Specifies the scaling factor for kProcessPerSiteUpToMainFrameThreshold

Specifies the scaling factor for kProcessPerSiteUpToMainFrameThreshold
feature. This factor will be multiplied to the calculated size of a top
level frame in the process and ensure there is more than that enough
space in the process. For example if the expected size of a top level frame

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.

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/374606637: When this is enabled, race-network-and-fetch-hander will
prioritize the response processing for the network request over the

Trial to disable synchronous draw for synchronous compositor (ie Android

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

Controls whether to isolate sites of documents that specify an eligible

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).

When the context menu is triggered, the browser allows motion in a small
region around the initial touch location menu to allow for finger jittering.
This param holds the movement threshold in DIPs to consider drag an
intentional drag, which will dismiss the current context menu and prevent new

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

Controls whether the WebUSB API is enabled:

When enabled, will no longer cache java side AccessibilityNodeInfo objects.

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 crbug.com/439682405

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

 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.

 Fix for crbug.com/403358869

 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

 In AIPageContentAgent::ComputeHitTestableNodesInViewport, the hit test
 may hit the same node multiple times, which causes issues with computing
 the final z-order of page elements. This flag will filter those
 duplicate results first before doing any further processing.

 Extension access to "AIPromptAPI".

 An OT feature name is required to satisfy implied_by build checks.
 The feature reuses AIPromptAPIMultimodalInput, but any origin trial
 features in the implied_by list will enable this feature as well.

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

 Fix for https://crbug.com/41238177.

 https://crbug.com/40681200

 Enables the new behavior for this spec change:
 https://github.com/whatwg/html/pull/11457
 https://issues.chromium.org/issues/433545121
 https://chromestatus.com/feature/5179013869993984

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

 Switch for https://crbug.com/445371140 which changes the initial value
 for position-visibility to 'anchors-visible' per current spec.

 https://chromestatus.com/feature/5083257285378048

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

 Fix Asymmetric word navigation behavior on Windows when punctuation follows whitespace
 See https://crbug.com/40252703

 When enabled, perform async IPCs from CookieJar::SetCookie to the
 network service.

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

 there is no need to collapse the whitespace between them.
 https://crbug.com/406053617

 Killswitch for https://crbug.com/40947850.

 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.

 A developer opt-out for background page freezing.

 https://chromestatus.com/feature/4830298126417920

 No status because this blink runtime feature doesn't work by itself.
 It's controlled by the corresponding Chromium feature,
 fingerprinting_protection_interventions::features::kBlockCanvasReadback
 through modified_runtime_features and setting its status in the browser
 process.

 https://chromestatus.com/feature/5176753681203200

 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.

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

 Remove the restriction that drawElementImage can only draw immediate children
 of the canvas, and allow drawing canvas descendants.

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

 https://crbug.com/394052224

 This flag exists only for testing and should not be changed to stable.
 Used for canvas noising tests.

 crbug.com/389726691.

 crbug.com/389726691.

 crbug.com/450531794.

 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.

 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

 crbug.com/446475645

 Changes the caret's affinity to upstream, preventing spaces
 from appearing in the previous line when typing at the start
 of a wrapped line. See https://crbug.com/40677155

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

 If focus is not at canonical position then spellcheck should be deactivated.
 crbug.com/396485529

 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

 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

 Allows top-level sites to restrict collection of high-entropy UA client
 hints (from 3Ps, or itself) via the getHighEntropyValues API.
 crbug.com/385161047

 Enables clipboardchange event API for listening for changes to the
 system clipboard
 https://chromestatus.com/feature/5085102657503232

 This ensures that clipboard event fires on a target node which is
 focused in case no visible selection is present.
 crbug.com/40735783

 Allows usecounter in ClipboardItem

 Support ClipboardItemData of Promise<DOMString> type according to spec
 https://w3c.github.io/clipboard-apis/#typedefdef-clipboarditemdata

 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

 Enable the rec2100-linear color space in CSS and PredefinedColorSpace.

 Makes the command event not composed. Launched in M141.
 https://github.com/whatwg/html/pull/11255
 https://issues.chromium.org/issues/414826954

 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

 Fix for https://crbug.com/40659076. When enabled, queryCommandState for
 'subscript' or 'superscript' with a caret selection will consider
 ancestor <sub> or <sup> elements, matching the behavior for range
 selections.

 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.

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

 CPU Performance API, work in progress.
 https://chromestatus.com/feature/5189864286978048
 https://github.com/explainers-by-googlers/cpu-performance

 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

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

 An anchor-positioned element should stay within its containing block,
 and not "escape" beyond the fragmentation context root and use the
 bounding box of the fragmented anchor with fragmentation applied.

 An update of anchor positioning (primarily how scrolling affects
 layout, but includes other inter-connected changes).

 Let transforms affect anchor() and anchor-size() functions.

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

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

 https://chromestatus.com/feature/5459864205393920
 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/5082469066604544

 Need a feature entry

 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://github.com/w3c/csswg-drafts/issues/12090#issuecomment-3204775586

 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-borders-4/#corner-shaping

 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

 https://drafts.csswg.org/css-anchor-position-2/#anchored

 crbug.com/417306102

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

 https://chromestatus.com/feature/5157805733183488

 https://chromestatus.com/feature/5157805733183488

 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

 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

 CSS if() function for custom properties. Flag is used only for media
 queries support in conditions.
 https://drafts.csswg.org/css-values-5/#if-notation.

 CSS if() function for custom properties. Flag is used only for style
 queries support in conditions.
 https://drafts.csswg.org/css-values-5/#if-notation.

 CSS if() function for custom properties. Flag is used only for supports
 queries support in conditions.
 https://drafts.csswg.org/css-values-5/#if-notation.

 https://chromestatus.com/feature/6289894144212992

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

 https://crbug.com/444386484

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

 https://chromestatus.com/feature/5261280285949952

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

 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

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

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

 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.

 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

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

 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.

 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/1463890: CSS text-autospace property

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

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

 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/4850737974345728

 appearance:base-select for <select multiple> and <select size=n>
 https://issues.chromium.org/issues/357649033

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

 see crbug.com/341313078

 https://chromestatus.com/feature/5134293578285056

 https://crbug.com/448174611

 https://crbug.com/393631108

 https://crbug.com/393631108

 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

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

 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

 https://chromestatus.com/feature/5067126381215744

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

 https://chromestatus.com/feature/5111042975465472
 document.patch, <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 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.

 See https://crbug.com/379170477

 ElementInternals.type allows web authors to create autonomous
 custom elements that inherit specific behaviors from native
 HTML elements, while maintaining the ability to use shadow DOM
 and custom rendering.
 crbug.com/422947646
 https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/ElementInternalsType/explainer.md

 See: crbug.com/420857717

 See: crbug.com/40771555

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

 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).

 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.

 crbug.com/438220615

 crbug.com/411739501

 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/

 2-D grid navigation functionality of focusgroup is considered out of
 scope for the initial implementation.
 crbug.com/445992558

 crbug.com/40398871

 crbug.com/41170551

 crbug.com/393391746

 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

 The FormControlRange interface allows web authors to create
 Range-like objects of the value of <textarea> and <input>
 elements.
 crbug.com/421421332
 https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/FormControlRange/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 <input>
 and <select> even when they had autocomplete=off.

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

 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

 Enables Skipping children for invisible select elements containing
 non-editable node while calculating end of paragraph.

 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

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

 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.

 Adds support for command=toggle-interest, for use by the command
 invokers API, targeting an interest invoker (with interestfor). This is
 a sub-feature of the HTMLInterestForAttribute feature.
 https://open-ui.org/components/interest-invokers.explainer/

 Adds support for the 'request-close' command.
 https://open-ui.org/components/invokers.explainer/

 Return a natural width/height of zero from
 HTMLImageElement.naturalWidth/Height for SVG images that don't have a
 natural width/height set.

 Adds support for the interestfor attribute. See crbug.com/326681249.
 https://open-ui.org/components/interest-invokers.explainer/
 This shipped in M142 and the flag can be removed in M144.

 Adds support for the ::interest-hint pseudo element, which is a sub-
 feature of the HTMLInterestForAttribute 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.

 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

 Improved retargeting behavior of ToggleEvent.source and
 CommandEvent.source to match Event.relatedTarget.
 crbug.com/420639769
 Enabled in M142, can be removed in M144.

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

 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.

 Enable DataTransfer propagation to input events for insertFromPaste,
 insertFromDrop, and insertReplacementText operations on content-editables.

 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>.

 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

 Adds !important to [inert] {interactivity: auto} in the UA
 stylesheet. Resolved in the CSSWG here:
 https://github.com/w3c/csswg-drafts/issues/12049#issuecomment-3303716541
 This killswitch is shipping in M142, and can ge removed in M144.

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

 Fixes a bug after find-in-page tries to return focus to
 the page. This change shipped in M142, and this flag can
 be removed in M144.

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

 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

 Improves the logic for removing focus from a currently focused <a>
 element when its href attribute is removed by considering other ways
 that an <a> may be focusable. Shipped in M142, should be safe to
 remove in M144.
 https://issues.chromium.org/issues/443585794

 Reverse origin trial allowing Local Network Access requests on
 non-secure contexts (but still requiring a permission grant from the
 user).

 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

 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

 Enables macOS system-level clipboard permission checking using
 NSPasteboard.accessBehavior API (available on macOS 15.4+).
 This allows web applications to respect user's clipboard privacy
 settings in System Settings > Privacy & Security > Clipboard.

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

 Enables MathML ancestor context preservation during copy-paste
 serialization. When enabled, copying partial MathML content includes
 the containing <math> element to preserve semantic context and
 namespace declarations.

 Set to reflect the kMediaEngagementBypassAutoplayPolicies feature.

 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.

 ModulePreloadReferrer enables modulepreload to send proper referrer
 headers as specified in the HTML spec. Behind a flag for safer rollout.
 https://crbug.com/441933555

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

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

 Experimental support for Multicast in Direct Sockets API.
 https://github.com/explainers-by-googlers/multicast-in-direct-sockets

 crbug.com/437612643

 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

 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

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

 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.

 Originating elements are implicit anchors for pseudo elements.
 This is a spec change since anchor positioning was shipped in Blink.
 https://issues.chromium.org/issues/408223892

 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.

 Fix for https://crbug.com/40716515.
 Killswitch M141.

 Killswitch M142. Overrides the above to enable PaintOffsetTranslation
 for all composited LayoutObjects.

 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

 Tracking bug for the implementation: crbug.com/352249547
 This flag adds having the option to show an icon in the Permission
 element, if developers want to.
 The flag will enable us to land the feature over multiple CLs, and will
 be enabled after the feature has been fully implemented.

 crbug.com/398955086

 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

 Kill switch for removing x-self, y-self as valid values.
 Enabling this flag will make x-self and y-self aliases of
 self-x and self-y at parse time.
 https://crbug.com/448642325

 Kill switch for https://crbug.com/448173938 which changes position
 visibility to ignore non-clipping ancestors.

 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

 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

 When enabled, preserves dropEffect in drag event set during dragover
 events.

 When enabled, prevents undo to be applied if the enclosing block
 is not editable

 Controls the aggregate error reporting feature, which allows for
 contributions to be made conditional on error conditions that can be
 hit when using the API. This also defers contribution merging and
 modifies the budgeting flow.
 https://chromestatus.com/feature/5194896325214208

 Controls whether Private Aggregation's "maxContributions" field is
 enabled for Shared Storage callers. If disabled, the field will be
 ignored. https://chromestatus.com/feature/5189366316793856

 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.

 Promisify programmatic scroll methods in Element and Window.
 https://crbug.com/41406914

 Propagate overscroll-behavior from the root element rather than the
 body element. crbug.com/41453796

 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.

 Allowing pseudo-elements to have focus.

 ChromeStatus: https://chromestatus.com/feature/6194847180128256

 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

 If enabled, both Accept-Language HTTP header and JavaScript getter will
 be reduced.

 If enabled, the amount of RAM reported through the Navigator
 interface will be hard-coded to 8gb.

 If enabled, the number of CPU cores reported through the Navigator
 interface will be hard-coded to 8.

 If enabled, the screen sizes reported through the Screen interface
 will be limited to the size of the viewport unless Window Management
 permission has been granted.

 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 platform version in User-Agent Data will be removed.
 This feature is limited to Linux only.

 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.

 This flag allows more characters to be accepted as valid names in the
 createElement and attribute related DOM APIs.
 https://github.com/whatwg/dom/pull/1079
 http://crbug.com/40228234
 https://chromestatus.com/feature/6278918763708416

 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.

 After paste operation removes the placeholder <br> tag
 that gets inserted in contenteditable as placeholder for newline

 Fix for removeFormat command incorrectly preserving background-color
 when removing styles from elements. Prevents background-color from being
 re-applied to child elements during style removal.
 See https://crbug.com/41438799

 See https://issues.chromium.org/issues/41474791

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

 See https://github.com/whatwg/html/issues/11070
 ChromeStatus: https://chromestatus.com/feature/5207202081800192

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

 See https://crbug.com/40896371 for details.

 Constrains text selections to stay within table cell boundaries
 (e.g., triple-click paragraph selection)
 See crbug.com/40852213.

 If enabled, makes the root scrollbars' foreground elements follow the
 browser

 Route matching, @route CSS rule, script type="routemap".
 https://chromestatus.com/feature/4771962874363904

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

 HTML event loop invoking 'Run snapshot post-layout state steps' from
 the CSSOM View per spec proposal.

 This flag is for fixing validation error
 for valid email address using IDN.
 This may ship in M142, and this flag can be
 removed in M144 pending no issues.
 See https://issues.chromium.org/issues/429490608

 Spec: https://wicg.github.io/sanitizer-api/
 Tracking bug: crbug.com/356601280

 https://wicg.github.io/webcomponents/proposals/Scoped-Custom-Element-Registries
 https://github.com/whatwg/html/issues/10854
 Spec PRs:
 https://github.com/whatwg/html/pull/10869
 https://github.com/whatwg/dom/pull/1341

 https://github.com/WICG/view-transitions/blob/main/scoped-transitions.md

 https://github.com/w3c/window-management/issues/149

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

 crbug.com/378692756

 TODO(355460994): Remove after M129.
 scroll into root frame didn't take scrollbar and borders into account,
 while this is fixed, to avoid any web compat issues we have this killswitch.

 TODO(crbug.com/401443093): Remove after M141.

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

 https://github.com/w3c/csswg-drafts/issues/9367#issuecomment-1854280461

 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.

 Allows CSS styling of browser search results.
 https://issues.chromium.org/issues/339298411
 https://chromestatus.com/feature/5195073796177920

 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.

 Implements new UX for SPC including new output states, payment
 instrument details and payment entities logos.

 SelectAudioOutput API
 https://chromestatus.com/feature/5164535504437248

 The selectedcontentelement attribute is for connecting select elements
 to arbitrary <selectedcontent> elements.
 https://github.com/openui/open-ui/issues/1063

 See https://crbug.com/40664519
 Disabled due to UI freeze issues, see https://crbug.com/448833953.

 Killswitch M141.

 https://issues.chromium.org/issues/40502558

 https://issues.chromium.org/issues/40502558

 See https://crbug.com/395544401

 See https://chromestatus.com/feature/5203433409871872

 See https://chromestatus.com/feature/4811835974615040

 Makes the logic to choose between ListBox (in-page) or MenuList
 (dropdown) select element modes the same between mobile and desktop.
 Without this flag, mobile will always use MenuList and desktop always
 makes <select multiple> a ListBox.
 https://chromestatus.com/feature/5412736871825408
 https://issues.chromium.org/issues/439964654

 Separate defer and module script execution into individual tasks
 to comply with HTML spec requirement to "spin the event loop" between
 each script execution. This prevents long tasks and improves responsiveness.
 https://crbug.com/40894694

 Support for Service Worker background sync APIs in Dedicated Workers.
 See https://chromestatus.com/feature/6497653025931264
 See https://issues.chromium.org/issues/40364838

 Support for Service Worker APIs in Dedicated Workers.
 See https://chromestatus.com/feature/6497653025931264
 See https://issues.chromium.org/issues/40364838

 Reference Target allows IDREF attributes to refer inside Shadow DOM.
 crbug.com/346835896

 If enabled, Reference Target will support aria-owns.
 https://github.com/WICG/webcomponents/issues/1091

 If enabled, SharedWorker supports extendedLifetime
 https://github.com/whatwg/html/issues/10997

 If enabled, only call ResourceLoadObserver callbacks if the DevTools
 panel is open.

 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.

 Fix for crbug.com/41393366

 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.

 Whether spatial navigation should use cursor inheritance to exclude
 nodes where cursor is inherited. Kill-switch that can be remove once
 the change goes through a stable release.

 This is a flag that re-enables some deprecated/removed "special rules"
 that apply to the styles of an <h1> element nested within <article>,
 <aside>, <nav>, or <section>. It is disabled by default, and here as a
 Finch killswitch only. This was shipped (disabled) in M140, and the flag
 can be removed in M142.

 Kill switch for change to unify image-set and srcset selection logic.

 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

 Preserves the sticky user activation state after a page navigates to
 another same-origin page. https://crbug.com/433729626

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

 Gates the locks() method on a storage bucket.

 Enforces that MIME types matched via *+json wildcards have HTTP token
 compliant type and subtype (rejects invalid characters) in addition to
 requiring a single slash.

 Treat SVG documents in <object>/<embed> as replaced elements
 https://issues.chromium.org/41302806

 Disable "external" XSLT stylesheets in SVGImage.

 This is used for emoji variation selectors support in system
 fallback matching. This is a workaround solution that helps to
 avoid incorrect font matching due to lack of cmap format 14
 subtable in system emoji fonts on various platforms.
 This should be eventually removed when the custom emoji font
 is shipped with Chrome or when system emoji fonts will have
 cmap format 14 subtable.

 When checking the shadow tree during invoke(),
 use the invocationTargetInShadowTree saved before
 calling the listener.
 This was added in M142 and can be removed after M144.
 https://issues.chromium.org/issues/41408360

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

 For unit tests.

 This is a feature used for testing what happens when an origin trial
 feature has browser-process read/write access. It should never be used
 in production code.

 For unit tests.

 For unit tests.

 For unit tests.

 For unit tests.

 For unit tests.

 crbug.com/442551790

 crbug.com/414858401

 crbug.com/414858401

 crbug.com/435186193

 crbug.com/40812040

 crbug.com/368657256

 crbug.com/442481227

 https://crbug.com/41492459

 crbug.com/431660829

 crbug.com/431660829

 crbug.com/331123676

 This feature is used to inform the renderer of a user bypass from the
 browser process to disable third-party storage partitioning.

 This feature allows calling the Topics API via an image
 attribute.

 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 enabled by default in Android, where
 TouchDragOnShortPress is not shipped due to interactions with the OS that
 caused issues in the behavior.
 Please see https://issues.chromium.org/40823294

 This feature enables drag and drop using touch input devices. Replaces
 the old "--enable-touch-drag-drop" and "--disable-touch-drag-drop"
 switches.
 Enabled by default in Android, ChromeOS and Windows.

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

 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.

 Traverse flat tree to find start and end of paragraph in delete
 selection to handle slot distribution in details.
 See https://crbug.com/413595949

 When enabled, treats the initial navigation to about:blank#fragment in
 an MHTML document as a cross-document navigation.

 Although it appears to be a same-document fragment navigation, MHTML
 loading replaces the initial empty document with a new committed
 document that has an opaque origin.

 This feature acts as a kill switch for https://crbug.com/40580002.

 Adapt Trusted Types to its new spec, as part of HTML.
 Tracking bug: 330516530

 This is a kill switch for the unprefixed Web Speech API.

 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.

 If enabled, notify the associated DisplayCutoutHost of changes in
 complex safe area constraint usage on the page.
 Only Android may make use of this feature currently.

 Fix for https://crbug.com/436624850
 Ensures trivialtext is updated after fragment creation from text
 by calling UpdateTrivialReplacementText()

 Android currently uses low-quality interpolation, while other platforms
 default to medium-quality. This flag is for experimenting with changing
 the value on Android. See: https://crbug.com/374315986.

 This flag uses the original DOM text for input when the password
 echo is enabled to create the offset_map.

 Fix for https://crbug.com/421314614

 Fix for https://crbug.com/354497121

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

 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).

 https://chromestatus.com/feature/5183481574850560

 https://chromestatus.com/feature/6024844719947776

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

 https://chromestatus.com/feature/5077691662073856

 https://chromestatus.com/feature/5077691662073856
 Allows an Enterprise Policy to override WebAudioBypassOutputBuffering

 https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-renderquantumsize

 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.

 Prototyping https://github.com/w3c/webauthn/issues/2144

 https://w3c.github.io/webauthn/#dom-publickeycredentialcreationoptions-attestationformats

 Enables providing a URL to retrieve a WebAuthn challenge.
 https://chromestatus.com/feature/5109012922892288

 https://w3c.github.io/webauthn/#dom-clientcapability-conditionalcreate

 Prototyping https://github.com/w3c/webauthn/issues/2228

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

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

 Adding post-quantum algorithms (ML-DSA, ML-KEM) to WebCrypto.
 Also adding ChaCha20-Poly1305 while we're at it.

 https://chromestatus.com/feature/5198951632470016

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

 Switch WebGL to use an experimental implementation where WebGL calls
 are translated in Blink, via ANGLE, to WebGPU calls. Note that this
 is not marked as "experimental" because it is not an incremental
 addition like other experimental features but a code switch, so we
 don't want to enable it when testing all "experimental Web platform
 features".

 Launch feature flag for WebGPU Compatibility Mode
 https://chromestatus.com/feature/6436406437871616

 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.

 https://chromestatus.com/feature/5110223547269120

 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 (non-WebView), Win, ChromeOS, and Mac.
 This is done in chrome/renderer/chrome_content_renderer_client.cc to prevent
 making the API available to Linux and WebView. Ideally we would set the status
 below to "stable" once we can do so without significant test expectation duplication.

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

 Fetches the WebUI code cache from the resource bundle asynchronously
 on a worker thread.

 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.

 A feature flag that controls whether XSLT is supported by the browser.
 crbug.com/435623334.

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