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Experimental web platform features are not yet part of the official web platform specifications and are marked as "experimental" in Chromium.

Polypane ships with these features (and more) enabled by default. Other Chromium browsers let you enable these on a "flags" settings page.

Added in Chromium 133 current

  • CSS Caret Animation
    CSSCaretAnimationchromestatus.com

    Chromium supports animation of the caret-color property, but when animated the default blinking behavior of the caret interferes with the animation. For instance, see the example at https://drafts.csswg.org/css-ui/#caret-animation where an animation from blue to red and back is rendered as a blinking cursor that is randomly blue or red. The CSS caret-animation property has two possible values: auto and manual, where auto means browser default (blinking) and manual means the page author is controlling the caret animation. In addition, via a user stylesheet, it allows users who are disturbed by or have adverse reactions to blinking or flashing visuals to disable the blinking.

  • CSS Shape Function
    CSSShapeFunctionchromestatus.com

    shape() allows responsive free-form shapes in clip-path. It lets the author define a series of commands, equivalent to the commands in path(), but where the commands accept responsive units (e.g. % or vw), as well as any CSS values such as custom properties or rather than pixel-values. See https://drafts.csswg.org/css-shapes-2/#shape-function

  • Paint Timing Mixin
    PaintTimingMixinchromestatus.com

    Expose "paintTime" and "presentationTime" in event timing, element timing, LCP, long animation frames, paint timing. "paintTime" means the time when the rendering phase ended and the browser started the paint phase. "presentationTime" means the time when the "pixels reached the screen", which is somewhat implementation-defined

  • Rel Opener Bcg Dependency Hint
    RelOpenerBcgDependencyHintchromestatus.com

    Extends the use of the "opener" rel type to same-window navigations to signal to the browser that the destination page will open a new window and the referring page expects to be able to access it. Some user agents perform browsing context group changes on navigation that aren't strictly necessary for security in order to improve performance. This results in named window reuse not being possible across a back navigation. Annotating an anchor element with "opener" will signal to the user agent that performing a browsing context group change would break a future opener relationship.

  • New features in Chromium 133 with missing description
    Back Forward Cache Update Not Restored Reasons Name
    BackForwardCacheUpdateNotRestoredReasonsName
    Correct Template Form Parsing
    CorrectTemplateFormParsing
    CSS Anchor Position Area Visual Position
    CSSAnchorPositionAreaVisualPosition
    CSS Scope Import
    CSSScopeImport
    CSS Sibling Functions
    CSSSiblingFunctions
    CSS View Transition Match Element
    CSSViewTransitionMatchElement
    Customizable Select Element Accessibility Issues
    CustomizableSelectElementAccessibilityIssues
    Disable Third Party Storage Partitioning3
    DisableThirdPartyStoragePartitioning3
    Identity Digest
    IdentityDigest
    Long Animation Frame Source Char Position
    LongAnimationFrameSourceCharPosition
    Skip Callbacks When Dev Tools Not Open
    SkipCallbacksWhenDevToolsNotOpen
    Topics Img API
    TopicsImgAPI
    User Defined Entry Point Timing
    UserDefinedEntryPointTiming
    Web Authentication Challenge Url
    WebAuthenticationChallengeUrl
    Web Crypto Ed25519
    WebCryptoEd25519
    WebGPU Allow Null In Pipeline Layout Entries
    WebGPUAllowNullInPipelineLayoutEntries
    WebGPU Feature Level
    WebGPUFeatureLevel
    Window On Move Event
    WindowOnMoveEvent

Added in Chromium 132 Polypane 23.1.1

  • Clipboard Item With DOM String Support
    ClipboardItemWithDOMStringSupportchromestatus.com

    The ClipboardItem, which is the input to the async clipboard write method, now accepts string values in addition to Blobs in its constructor. ClipboardItemData can be a Blob, a string, or a Promise that resolves to either a Blob or a string.

  • CSS Inert

    The interactivity property specifies whether an element and its flat tree descendants (including text runs) are inert or not. Making an element inert affects whether it can be focused, edited, selected, and searchable by find-in-page. It also affects whether it is visible in the accessibility tree. The syntax is: interactivity: auto | inert

  • CSS Nested Pseudo Elements
    CSSNestedPseudoElementschromestatus.com

    Allows to style pseudo elements that are nested inside other pseudo elements. So far, support is defined for: ::before::marker ::after::marker With ::column::scroll-marker being supported in the future.

  • Document Isolation Policy
    DocumentIsolationPolicychromestatus.com

    Document-Isolation-Policy allows a document to enable crossOriginIsolation for itself, without having to deploy COOP or COEP, and regardless of the crossOriginIsolation status of the page. The policy is backed by process isolation. Additionally, the document non-CORS cross-origin subresources will either be loaded without credentials or will need to have a CORP header.

  • HTML Dialog Light Dismiss
    HTMLDialogLightDismisschromestatus.com

    One of the nice features of the Popover API is its light dismiss behavior. This chromestatus is about bringing that same capability to `<dialog>`. A new `closedby` attribute controls behavior: `<dialog closedby=none>` - no user-triggered closing of dialogs at all. `<dialog closedby=closerequest>` - user pressing ESC (or other close trigger) closes the dialog `<dialog closedby=any>` - user clicking outside the dialog, or pressing ESC, closes the dialog. Akin to `popover=auto` behavior.

  • Indexed Db Get All Records
    IndexedDbGetAllRecordschromestatus.com

    getAllRecords() combines getAllKeys() with getAll() to enumerate both primary keys and values at the same time. For an IDBIndex, getAllRecords() also provides the record's index key in addition to the primary key and value. Lastly, getAllRecords() offers a new direction option to enumerate records sorted by key in descending order. This proposal adds getAllRecords() to both IDBObjectStore and IDBIndex. getAllRecords() creates a new IDBRequest that queries its IDBObjectStore or IDBIndex owner. The IDBRequest completes with an array of IDBRecord results. Each IDBRecord contains the key, primaryKey and value attributes. For IDBIndex, key is the record's index key. For IDBObjectStore, both key and primaryKey return the same value. The pre-existing IDBCursorWithValue interface contains the same attributes and values for both IDBObjectStore and IDBIndex. However, unlike getAllRecords(), a cursor may only read one record at a time.

  • Layout Stretch
    LayoutStretchchromestatus.com

    A keyword for CSS sizing properties (e.g. 'width', 'height') that allows elements to grow to exactly fill their containing block's available space. It is similar to '100%', except the resulting size is applied to the element's margin box instead of the box indicated by 'box-sizing'. Using this keyword allows the element to keep its margins while still being as large as possible. An unprefixed version of '-webkit-fill-available'.

  • Multiple Import Maps
    MultipleImportMapschromestatus.com

    Import maps currently have to load before any ES module and there can only be a single import map per document. That makes them fragile and potentially slow to use in real-life scenarios: Any module that loads before them breaks the entire app, and in apps with many modules the become a large blocking resource, as the entire map for all possible modules needs to load first. This feature is to enable multiple import maps per document, by merging them in a consistent and deterministic way.

  • Resource Timing Final Response Headers Start
    ResourceTimingFinalResponseHeadersStartchromestatus.com

    Resource timing: - responseStart returns the first response, either early hints (interim) or final - Expose the final response headers (2xx/4xx/5xx) time as finalResponseHeadersStart.

  • Selection On Shadow DOM With Delegates Focus
    SelectionOnShadowDOMWithDelegatesFocuschromestatus.com

    A shadow host with delegatesFocus set to true will delegate its focus to its first focusable child. On a mouse click event, the child will receive focus and the event will be marked as handled. No further event dispatching is done. This is a problem because the steps to handle text selection afterward are not ran and the selection does not recognize the focused element as part of the selection. We fix this by continuing event handling even after an element was delegate focused and update how selection recognizes having focus in a shadow tree.

  • New features in Chromium 132 with missing description
    Allow Preloading With C S P Meta Tag
    AllowPreloadingWithCSPMetaTag
    AOM Aria Relationship Properties Aria Owns
    AOMAriaRelationshipPropertiesAriaOwns
    Aria Actions
    AriaActions
    CSS Overflow Container Queries
    CSSOverflowContainerQueries
    CSS Supports At Rule Function
    CSSSupportsAtRuleFunction
    Event Timing Selection Auto Scroll No Interaction Id
    EventTimingSelectionAutoScrollNoInteractionId
    Java Script Compile Hints Magic Always Runtime
    JavaScriptCompileHintsMagicAlwaysRuntime
    Performance Navigation Timing Confidence
    PerformanceNavigationTimingConfidence
    Selectedcontentelement Attribute
    SelectedcontentelementAttribute
    Timestamp Based C L S Tracking
    TimestampBasedCLSTracking
    Video Frame Metadata Background Blur
    VideoFrameMetadataBackgroundBlur
    Web XR G P U Binding
    WebXRGPUBinding
    Web XR Layers Common
    WebXRLayersCommon

Added in Chromium 131

  • Animation Progress API
    AnimationProgressAPIchromestatus.com

    Adds an "overallProgress" property to the JavaScript class Animation[1]. This property provides authors with a convenient and consistent representation of how far along an animation has advanced across its iterations and regardless of the nature of its timeline[2]. [1] https://developer.mozilla.org/en-US/docs/Web/API/Animation [2] https://developer.mozilla.org/en-US/docs/Web/API/AnimationTimeline

  • CSS Anchor Size Insets Margins
    CSSAnchorSizeInsetsMarginschromestatus.com

    Allow anchor-size() values for inset and margin properties. Originally, anchor-size() was only allowed in sizing properties. The specification was changed to allow anchor-size() in insets and margins as well.

  • Customizable Select
    CustomizableSelectchromestatus.com

    This change makes the HTML parser allow additional tags in <select> besides <option>, <optgroup>, and <hr>. This change is in support of the customizable <select> feature but is being shipped first because it can be done separately and has some compat risk which I'd like to get feedback on. This feature is gated by the temporary policy (SelectParserRelaxationEnabled). This is a temporary transition period, and the policy will stop working on milestone M141. Customizable select explainer: https://open-ui.org/components/customizableselect/ I did a compat analysis and determined that the vast majority of sites which would see the effects of the parser changes would not have their behavior changed. More details here: https://github.com/whatwg/html/issues/10310 If there are major issues with this change, I will reassess and make adjustments to the parser as needed.

  • Dialog Element Toggle Events
    DialogElementToggleEventschromestatus.com

    It is useful for web authors do determine when their <dialog> elements open and close. popover already has `ToggleEvent` which is dispatched when a popover opens or closes, but <dialog> does not. The current way to detect when a <dialog> opens is to register a mutation observer to check for open, however, this is quite a lot of work where an event would be easier. This change incorporates the same `ToggleEvent`s that popovers dispatch, but for `<dialog>` elements: when `showModal` or `show` is called, <dialog> dispatches a ToggleEvent with newState=open. When a dialog is closed (via form or button or closewatcher) it should dispatch a ToggleEvent with newState=closed.

  • Fetch Body Bytes
    FetchBodyByteschromestatus.com

    Add a bytes() method to the Request and Response interfaces, which returns a promise that resolves with a Uint8Array. While Request and Response have an arrayBuffer() method, we can't read directly from a buffer. We have to create a view such as a Uint8Array to read it. The bytes() method improves the ergonomics of getting the body of Request and Response.

  • Shadow Root Reference Target
    ShadowRootReferenceTargetchromestatus.com

    Reference Target is a feature to enable using IDREF attributes such as `for` and `aria-labelledby` to refer to elements inside a component's shadow DOM, while maintaining encapsulation of the internal details of the shadow DOM. The main goal of this feature is to enable ARIA to work across shadow root boundaries. A component can specify an element in its shadow tree to act as its "reference target". When the host component is the target of a IDREF like a label's `for` attribute, the reference target becomes the effective target of the label. The shadow root specifies the ID of the target element inside the shadow DOM. This is done either in JavaScript with the `referenceTarget` attribute on the `ShadowRoot` object, or in HTML markup using the `shadowrootreferencetarget` attribute on the `<template>` element.

  • New features in Chromium 131 with missing description
    CSS Accent Color Keyword
    CSSAccentColorKeyword
    CSS Pseudo Has Slotted
    CSSPseudoHasSlotted
    CSS View Transition Auto Name
    CSSViewTransitionAutoName
    Fontations Font Backend
    FontationsFontBackend
    View Transition Layered Capture
    ViewTransitionLayeredCapture
    Web Authentication Ambient
    WebAuthenticationAmbient
    Web Codecs Orientation
    WebCodecsOrientation

Added in Chromium 130 Polypane 22.1.1

  • CSS At Property String Syntax
    CSSAtPropertyStringSyntaxchromestatus.com

    Support for "<string>" syntax component name for registered custom properties.

  • CSS Pseudo Column
    CSSPseudoColumnchromestatus.com

    A ::column pseudo element, which allows applying a limited set of styles to the generated fragments. Specifically, this would be limited to styles which do not affect the layout, and thus can be applied post-layout.

  • CSS Relative Color Supports Currentcolor
    CSSRelativeColorSupportsCurrentcolorchromestatus.com

    Allow relative colors in CSS (using the 'from' keyword) to use 'currentcolor' as a base. This will make it easy for web developers to set complementary colors, based on an element's text color, for that element's borders, shadows, backgrounds, etc. This feature also includes use cases where color functions are nested with a dependency on currentcolor, for example `color-mix(in srgb, rgb(from currentcolor r g b), white))` or `rgb(from rgb(from currentcolor 1 g b) b g r)`.

  • Font Variant Emoji
    FontVariantEmojichromestatus.com

    Font-variant-emoji CSS property provides users an easy way to control between colored (emoji-style) and monochromatic (text-style) emoji glyphs presentations. This can be also done by adding an emoji Variation Selector, specifically U+FE0E for text and U+FE0F for emojis, after each emoji codepoint. Using font-variant-emoji CSS property allows web developers to select between emoji style (colored) emoji presentation, text style (monochromatic) emoji presentation and unicode default emoji presentation [0]. This property only affects emojis that are part of a Unicode emoji presentation sequence [1]. [0] https://www.unicode.org/reports/tr51/tr51-25.html#Emoji_Presentation [1] http://www.unicode.org/emoji/charts/emoji-variants.html

  • Popover Anchor Relationships
    PopoverAnchorRelationshipschromestatus.com

    This chromestatus represents the following related set of changes, which were resolved in https://github.com/whatwg/html/pull/9144#issuecomment-2195095228 and landed in https://github.com/whatwg/html/pull/10728: 1. add an imperative way to set invoker relationships between popovers: popover.showPopover({source}) 2. invoker relationships create implicit anchor element references.

  • Selection Is Collapsed Shadow DOM Support
    SelectionIsCollapsedShadowDOMSupportchromestatus.com

    Selection isCollapsed should return true if and only if the anchor and focus are the same. This should be true whether the selection starts/ends inside a light or a shadow tree. Currently, the Chrome implementation returns true if selection's anchor node is in a shadow tree, even if the selection itself is not collapsed. We fix this by removing the erroneous shadow tree check.

  • Web Authentication Client Capabilities
    WebAuthenticationClientCapabilitieschromestatus.com

    getClientCapabilities() method allows to determine which WebAuthn features are supported by the user's client. The method returns a list of supported capabilities, allowing developers to tailor authentication experiences and workflows based on the client's specific functionality.

  • New features in Chromium 130 with missing description
    Canvas2d Layers With Options
    Canvas2dLayersWithOptions
    Canvas2d Text Metrics Shaping
    Canvas2dTextMetricsShaping
    CSS Relative Color Late Resolve Always
    CSSRelativeColorLateResolveAlways
    CSS Visibility Inert
    CSSVisibilityInert
    Document Policy Expect No Linked Resources
    DocumentPolicyExpectNoLinkedResources
    Storage Access Header
    StorageAccessHeader
    System Fallback Emoji V S Support
    SystemFallbackEmojiVSSupport
    Web App Installation
    WebAppInstallation

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