Експериментальні функції в Firefox

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In order to test new features, Mozilla publishes a test version of the Firefox browser, Firefox Nightly, every day. Experimental features, for example implementations of proposed Web platform standards, are available. This page lists features that are in Nightly versions of Firefox along with information on how to activate them, if necessary. You can test your Web sites and applications before these features get released and ensure everything will still work with the latest Web technology capabilities.

To test these experimental features, you need to download Firefox Nightly or Firefox Developer Edition.

HTML

Функція Firefox Nightly Firefox Developer Edition Firefox Бета Firefox Release Переваги
Date and time inputs
The UI for the <input> date and time related input types.
Вимкнено
(available since 51)
Вимкнено
(available since 51)
Вимкнено
(available since 51)
--- dom.forms.datetime

CSS

Функція Firefox Nightly Firefox Developer Edition Firefox Бета Firefox Release Переваги
Grid Layout 40 40 Увімкнено
(available since 40, enabled by default since 52)
Вимкнено layout.css.grid.enabled
Subgrids Вимкнено Вимкнено Вимкнено Вимкнено layout.css.grid-template-subgrid-value.enabled
Logical values for clear and float CSS properties
The values clear: inline-start and clear: inline-end as well as float: inline-start and float: inline-end are making easier to create layouts that are agnostic to the text directionality.
45 45 Вимкнено Вимкнено layout.css.float-logical-values.enabled
Display stray control characters in CSS as hex boxes
This feature renders control characters (Unicode category Cc) other than tab (U+0009), line feed (U+000A), form feed (U+000C), and carriage return (U+000D) as a hexbox when they are not expected.
43 43 Вимкнено Вимкнено layout.css.control-characters.enabled
The transform-box property
Controls the box the relative values of transform-origin and transform relate too.
41 41 Вимкнено Вимкнено svg.transform-box.enabled
Basic shapes in clip-path
Adds the functions circle(), ellipse(), and polygon() to the set of possible values for clip-path. This is a part of CSS Masks Level 1.
Увімкнено
(available since 47, enabled by default since 53)
Увімкнено
(available since 47, enabled by default since 53)
Вимкнено
(available since 47)
Вимкнено
(available since 47)
layout.css.clip-path-shapes.enabled
Positioned CSS Masks
A subset of CSS Masks that includes longhand properties of CSS Masks, as well as a change in the shorthand property
51 51 53 Вимкнено
(planned for 53)
Controlled by a compile flag (MOZ_ENABLE_MASK_AS_SHORTHAND).
The font-display descriptor for @font-face
To improve Web fonts performance, @font-face has an experimental font-display descriptor.
Вимкнено
(available since 46)
Вимкнено
(available since 46)
Вимкнено
(available since 46)
Вимкнено
(available since 46)
layout.css.font-display.enabled
The touch-action CSS property
The touch-action CSS property is part of the Pointer Events specification and allows to specify how and in what way the user is able to manipulate an object by touch.
50 layout.css.touch_action.enabled

The shape-outside CSS property
The shape-outside CSS property is part of the CSS Shapes Module Level 1 specification and allows to specify a float area causing inline contents to wrap around a shape.

Firefox currently implements the <shape-box> values (bug 1309467) as well as the circle() (bug 1311244) and ellipse() (bug 1326406) functions.

Вимкнено
(available since 53)
layout.css.shape-outside.enabled
The contain CSS property
The contain CSS property is part of the CSS Containment Module Level 1 specification and allows to indicate that an element and its contents are independent of the rest of the document tree, allowing user agents to optimize the rendering of a page.
Вимкнено
(available since 45)
Вимкнено
(available since 45)
Вимкнено
(available since 45)
Вимкнено
(available since 45)
layout.css.contain.enabled

JavaScript

See also ECMAScript Next support for implemented features of ECMAScript 2016 and later, that are not experimental and thus available without preferences in Firefox Release.

Функція Firefox Nightly Firefox Developer Edition Firefox Бета Firefox Release Переваги
Additions to the ArrayBuffer object
Adds the ArrayBuffer.transfer() that returns a new ArrayBuffer whose contents have been taken from the oldBuffer's data (spec).
36 Вимкнено Вимкнено Вимкнено None
TypedObject objects (spec) Увімкнено Вимкнено Вимкнено Вимкнено None
SIMD (specification and polyfill) Увімкнено Вимкнено Вимкнено Вимкнено None
Shared Memory objects
SharedArrayBuffer
Atomics
Увімкнено
(available since 46)
Увімкнено
(available since 51)
Вимкнено
(available since 46)
Вимкнено
(available since 46)
javascript.options.shared_memory

APIs

Canvas & WebGL

Функція Firefox Nightly Firefox Developer Edition Firefox Бета Firefox Release Переваги
WEBGL_debug_renderer_info extension
The WEBGL_debug_renderer_info extension allows to transmit information useful to help debugging problems to the server.
42 42 Вимкнено Вимкнено webgl.enable-debug-renderer-info
OffscreenCanvas
The OffscreenCanvas interface provides a canvas that can be rendered off screen. It is available in both the window and worker contexts.
Вимкнено
(available since 44)
Вимкнено
(available since 44)
Вимкнено
(available since 44)
Вимкнено
(available since 44)
gfx.offscreencanvas.enabled
Hit regions
Whether the mouse coordinates are within a particular area on the canvas, is a common problem to solve. The hit region API allows you define an area of your canvas and provides another possibility to expose interactive content on a canvas to accessibility tools.
Вимкнено
(available since 30)
Вимкнено
(available since 30)
Вимкнено
(available since 30)
Вимкнено
(available since 30)
canvas.hitregions.enabled

 DOM

Функція Firefox Nightly Firefox Developer Edition Firefox Бета Firefox Release Переваги
WebVR API
The WebVR API allows to control and use virtual reality devices.
46
A major update of the interface happened in version 51.
46
A major update of the interface happened in version 51.
Вимкнено Вимкнено dom.vr.enabled
FlyWeb
FlyWeb is a project at Mozilla focused on bringing a new set of APIs to the browser for advertising and discovering local-area web servers.
51 Вимкнено Вимкнено Вимкнено dom.flyweb.enabled
HTMLMediaElement.seekToNextFrame()
Part of an experimentation process around support non-real-time access to media for tasks including filtering, editing, and so forth, the HTMLMediaElement.seekToNextFrame() advances the the current play position to the next frame in the media.
49
(Fundamental update in version 50)
49
(Fundamental update in version 50)
Вимкнено Вимкнено media.seekToNextFrame.enabled
GeometryUtils.getBoxQuads() (bug 917755) 31 31 Вимкнено Вимкнено layout.css.getBoxQuads.enabled
GeometryUtils.convertPointFromNode(),
GeometryUtils.RectFromNode(), and
GeometryUtils.convertQuadFromNode()
(bug 918189)
31 31 Вимкнено Вимкнено layout.css.convertFromNode.enabled
Node.rootNode
The Node.rootNode property returns a Node object representing the topmost node in the tree, or the current node if it's the topmost node in the tree.
This feature is kept experimental as its naming poses Web compatibility problems. It will be renamed in the future.
48 48 Вимкнено Вимкнено dom.node.rootNode.enabled
Performance Observer API
The PerformanceObserver interface is used to observe performance measurement events and be notified of new performance entries as they are recorded in the browser's performance timeline.
49 Вимкнено Вимкнено Вимкнено dom.enable_performance_observer
WebVTT Regions API
WebVTT regions are parts of the video viewport that provide a rendering area for WebVTT cues. The VTTRegion is the interface exposing the WebVTT cues.
This interface is considered to be in flux and isn't therefore activated in any version by default.
Вимкнено
(Experimental implementation since version 30)
Вимкнено Вимкнено Вимкнено media.webvtt.regions.enabled
Support for audio and video tracks
Implements HTMLMediaElement.audioTracks and HTMLMediaElment.videoTracks.
Firefox doesn't support multiple audio or video tracks, preventing the most common use cases for these properties to work properly. That's why these properties are not activated by default in any version.
Вимкнено
(Experimental implementation since version 33)
Вимкнено Вимкнено Вимкнено media.track.enabled
Better value for Event.timestamp
The property Event.timestamp is returning a DOMHighResTimeStamp, but the value is not the time since but since the reboot. This change allow for returning a timestamp relative to the Unix epoch.
32 (Windows)
43 (Linux)
32 (Windows)
43 (Linux)
Вимкнено Вимкнено media.track.enabled
Pointer Events 50 Вимкнено Вимкнено Вимкнено dom.w3c_pointer_events.enabled
MediaDevices.ondevicechange and the devicechange event
The MediaDevices.ondevicechange event handler and corresponding devicechange event make it possible to detect and react when audio and video devices are attached to or removed from the computer.

Вимкнено
51 (Mac)

Увімкнено
52 (Mac)
52 (Windows)
52 (Linux)

Вимкнено
51 (Mac)

Увімкнено
52 (Mac)
52 (Windows)
52 (Linux)

Вимкнено
51 (Mac)

Увімкнено
52 (Mac)
52 (Windows)
52 (Linux)

Вимкнено
51 (Mac)

Увімкнено
52 (Mac)
52 (Windows)
52 (Linux)

media.ondevicechange.enabled
Intersection Observer API
The Intersection Observer API allows you to configure a callback that is called whenever one item, called a target, intersects either the device viewport or a specified element called.
Вимкнено
(available since 53)
--- --- --- dom.IntersectionObserver.enabled
Web Animations API
The KeyframeEffectReadOnly.KeyframeEffectReadOnly() and KeyframeEffect.KeyframeEffect() constructors can be used to clone existing KeyframeEffectReadOnly object instances by being given the object to clone as their only parameter (see bug 1273784.) The KeyframeEffect.clone() method, which was meant to provide this functionality but was never implemented in Firefox, has been removed from the spec.
52 52 Вимкнено Вимкнено None

Developer Tools

Функція Firefox Nightly Firefox Developer Edition Firefox Бета Firefox Release Переваги
Debugger rewrite in HTML 52 52 Вимкнено Вимкнено devtools.debugger.new-debugger-frontend
Console rewrite in HTML 52 Вимкнено Вимкнено Вимкнено devtools.webconsole.new-frontend-enabled
Responsive Design Mode rewrite in HTML
A rewrite of Responsive Design Mode using HTML adds new features like a device selector (applies size, UA, dPR), UI redesign, and there's more still to come.
52 52 52 52 devtools.responsive.html.enabled
Experimental Performance tool options
Enables options in the UI for JIT optimizations, memory, etc.
41 Вимкнено Вимкнено Вимкнено devtools.performance.ui.experimental
Layout side panel
The Layout side panel allows to inspect and manage different CSS layout types like CSS Grid Layout.
Вимкнено
(available since 52)
Вимкнено
(available since 52)
--- --- devtools.layoutview.enabled

See also

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