Platform/Roadmap2026: Difference between revisions

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Related Links:
Related Links:
* [https://whattrainisitnow.com/calendar/ Firefox Release Calendar] (future)
* [https://whattrainisitnow.com/calendar/ Firefox Release Calendar] (future)
* [https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases Firefox release notes for developers] (past)<!-- Fx147-149, 150-... -->
* [https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases Firefox release notes for developers] (past)<!-- Fx147-149, 150wd-... -->
* [https://firefox-source-docs.mozilla.org/contributing/pocket-guide-shipping-firefox.html Pocket Guide: Shipping Firefox]
* [https://firefox-source-docs.mozilla.org/contributing/pocket-guide-shipping-firefox.html Pocket Guide: Shipping Firefox]


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* <code>popover=hint</code> ([https://bugzil.la/1867743 1867743])
* <code>popover=hint</code> ([https://bugzil.la/1867743 1867743])
* <code>alpha</code> & <code>colorspace</code> attributes in <code>&lt;input type=color&gt;</code>; elements ([https://bugzil.la/1919718 1919718])
* <code>alpha</code> & <code>colorspace</code> attributes in <code>&lt;input type=color&gt;</code>; elements ([https://bugzil.la/1919718 1919718])
* <code>&lt;img sizes=auto&gt;</code> ([https://bugzil.la/1819581 1819581])
* ...
* ...


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* units: <code>rcap</code>, <code>rch</code>, <code>rex</code>, <code>ric</code> ([https://bugzil.la/1740584 1740584])
* units: <code>rcap</code>, <code>rch</code>, <code>rex</code>, <code>ric</code> ([https://bugzil.la/1740584 1740584])
* <code>&lt;attr-type&gt;</code> values in <code>attr()</code> function ([https://bugzil.la/1986631 1986631], [https://bugzil.la/1998245 1998245])
* <code>&lt;attr-type&gt;</code> values in <code>attr()</code> function ([https://bugzil.la/1986631 1986631], [https://bugzil.la/1998245 1998245])
* <code>color-mix()</code> function multiple color arguments ([https://bugzil.la/2007772 2007772])
* <code>color-mix()</code> function multiple (2+) color arguments ([https://bugzil.la/2007772 2007772], [https://bugzil.la/2024171 2024171])
* <code>light-dark()</code> function <code>&lt;image&gt;</code> type for images, gradients ([https://bugzil.la/2023569 2023569])
* <code>shape()</code> function on by default ([https://bugzil.la/1982941 1982941])
* <code>shape()</code> function on by default ([https://bugzil.la/1982941 1982941])
* <code>:buffering</code>, <code>:muted</code>, <code>:paused</code>, <code>:playing</code>, <code>:seeking</code>, <code>:stalled</code>, <code>:volume-locked</code> allow you to style <code>&lt;audio&gt;</code> <code>&lt;video&gt;</code> elements ([https://bugzil.la/1707584 1707584], [https://bugzil.la/2014512 2014512])
* <code>:buffering</code>, <code>:muted</code>, <code>:paused</code>, <code>:playing</code>, <code>:seeking</code>, <code>:stalled</code>, <code>:volume-locked</code> allow you to style <code>&lt;audio&gt;</code> <code>&lt;video&gt;</code> elements ([https://bugzil.la/1707584 1707584], [https://bugzil.la/2014512 2014512], [https://bugzil.la/2020775 2020775])
* <code>::before</code> and <code>::after</code> on replaced elements ([https://bugzil.la/1931309 1931309])
* <code>::before</code> and <code>::after</code> on replaced elements ([https://bugzil.la/1931309 1931309])
* <code>::marker</code> pseudo-element support <code>counter-increment</code>, <code>counter-reset</code>, <code>counter-set</code>, <code>quotes</code> properties ([https://bugzil.la/2000404 2000404])
* <code>::marker</code> pseudo-element support <code>counter-increment</code>, <code>counter-reset</code>, <code>counter-set</code>, <code>quotes</code> properties ([https://bugzil.la/2000404 2000404])
* <code>revert-rule</code> keyword ([https://bugzil.la/2017307 2017307])
* <code>@container</code> <code>style()</code> queries ([https://bugzil.la/2014404 2014404])
* <code>@container</code> <code>style()</code> queries ([https://bugzil.la/2014404 2014404])
* CSS Anchor Positioning ([https://bugzil.la/1988225 1988225])
* CSS Anchor Positioning ([https://bugzil.la/1988225 1988225])
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** <code>position-anchor</code> property supports value <code>none</code> ([https://bugzil.la/1999972 1999972])
** <code>position-anchor</code> property supports value <code>none</code> ([https://bugzil.la/1999972 1999972])
* <code>overflow</code>, <code>overflow-x</code>, <code>overflow-y</code> properties supported on replaced elements ([https://bugzil.la/1999100 1999100])
* <code>overflow</code>, <code>overflow-x</code>, <code>overflow-y</code> properties supported on replaced elements ([https://bugzil.la/1999100 1999100])
* <code>overscroll-behavior</code>, <code>overscroll-behavior-x</code>, <code> overscroll-behavior-y</code>, <code> overscroll-behavior-block</code>, <code> and overscroll-behavior-inline</code> apply to scroll containers that have no scrollable overflow ([https://bugzil.la/1837436 1837436])
* <code>position-try-order</code> ([https://bugzil.la/2008537 2008537])
* <code>position-try-order</code> ([https://bugzil.la/2008537 2008537])
* <code>shape-outside</code> property support <code>xywh()</code> and <code>rect()</code> functions ([https://bugzil.la/1983187 1983187])
* <code>shape-outside</code> property support <code>xywh()</code> and <code>rect()</code> functions ([https://bugzil.la/1983187 1983187])
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Media-related APIs like WebRTC  
Media-related APIs like WebRTC  
* <code>HTMLMediaElement.captureStream()</code> ([https://bugzil.la/2017708 2017708])
* <code>HTMLMediaElement.captureStream()</code> ([https://bugzil.la/2017708 2017708])
* <code>RTCError</code> and <code>RTCErrorEvent</code> ([https://bugzil.la/1814459 1814459])
* <code>RTCIceTransport.role</code> ([https://bugzil.la/2018843 2018843])
* <code>RTCPeerConnectionIceErrorEvent</code> and <code>RTCPeerConnection.icecandidateerror</code> event ([https://bugzil.la/1561441 1561441])
* WebRTC MediaStreamTrackProcessor ([https://bugzil.la/1749532 1749532])
* WebRTC MediaStreamTrackProcessor ([https://bugzil.la/1749532 1749532])
* WebRTC VideoTrackGenerator ([https://bugzil.la/1749533 1749533])
* WebRTC VideoTrackGenerator ([https://bugzil.la/1749533 1749533])
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** DOMImplementation.createDocument()
** DOMImplementation.createDocument()
** customElements.define(), customElements.whenDefined()
** customElements.define(), customElements.whenDefined()
* <code>ariaNotify()</code> method on <code>Document</code> and <code>Element</code> ([https://bugzil.la/2018095 2018095])
* <code>CloseWatcher</code> interface ([https://bugzil.la/1966073 1966073])
* <code>CloseWatcher</code> interface ([https://bugzil.la/1966073 1966073])
* <code>CSSFontFaceDescriptors</code> interface ([https://bugzil.la/2019904 2019904])
* <code>Document.caretPositionFromPoint()</code> including argument <code>options.shadowRoots</code> ([https://bugzil.la/1550635 1550635], [https://bugzil.la/1914596 1914596])
* <code>Document.execCommand()</code> "<code>paste</code>" command in web content ([https://bugzil.la/1998195 1998195])
* <code>Document.execCommand()</code> "<code>paste</code>" command in web content ([https://bugzil.la/1998195 1998195])
* <code>HTMLSelectElement.showPicker()</code> support list of options in <code>&lt;datalist&gt;</code> ([https://bugzil.la/1998668 1998668])_
* <code>HTMLSelectElement.showPicker()</code> support list of options in <code>&lt;datalist&gt;</code> ([https://bugzil.la/1998668 1998668])
* ...
* ...


Revision as of 00:51, 2 June 2026

This article is a stub. You can help MozillaWiki by expanding it.

Platform 2026 Roadmap

Warning signWarning: This is page is actively in-progress and is incomplete.

Related Links:

These are areas of work planned for Gecko in 2026 for the Web Platform.

For current web platform documentation of these areas, see the subsections at:

HTML

  • popover=hint (1867743)
  • alpha & colorspace attributes in <input type=color>; elements (1919718)
  • <img sizes=auto> (1819581)
  • ...

CSS

  • units: rcap, rch, rex, ric (1740584)
  • <attr-type> values in attr() function (1986631, 1998245)
  • color-mix() function multiple (2+) color arguments (2007772, 2024171)
  • light-dark() function <image> type for images, gradients (2023569)
  • shape() function on by default (1982941)
  • :buffering, :muted, :paused, :playing, :seeking, :stalled, :volume-locked allow you to style <audio> <video> elements (1707584, 2014512, 2020775)
  • ::before and ::after on replaced elements (1931309)
  • ::marker pseudo-element support counter-increment, counter-reset, counter-set, quotes properties (2000404)
  • revert-rule keyword (2017307)
  • @container style() queries (2014404)
  • CSS Anchor Positioning (1988225)
    • align-items, align-self, justify-items, justify-self, place-items, and place-self properties support anchor-center value (1909339)
    • position-anchor property supports value none (1999972)
  • overflow, overflow-x, overflow-y properties supported on replaced elements (1999100)
  • overscroll-behavior, overscroll-behavior-x, overscroll-behavior-y, overscroll-behavior-block, and overscroll-behavior-inline apply to scroll containers that have no scrollable overflow (1837436)
  • position-try-order (2008537)
  • shape-outside property support xywh() and rect() functions (1983187)
  • vertical-align as shorthand property for alignment-baseline, baseline-shift, and baseline-source properties (1830771)
  • CSS properties and rendering of <fieldset> and <legend> (1935129)
    • margins, generated content, custom display values
  • View transition types (2001878)
  • ...

WebCompat:

  • -webkit-perspective property (1362499)
  • ...

CSSOM

  • CSS Typed Object Model Level 1 (1278697)
  • ...

SVG

  • SVG URL media fragments (1999989)
  • ...

Rendering

WebGPU:

  • ...

Media

  • JPEG XL Rust decoder prototype (1986393)

Media-related APIs like WebRTC

  • HTMLMediaElement.captureStream() (2017708)
  • RTCError and RTCErrorEvent (1814459)
  • RTCIceTransport.role (2018843)
  • RTCPeerConnectionIceErrorEvent and RTCPeerConnection.icecandidateerror event (1561441)
  • WebRTC MediaStreamTrackProcessor (1749532)
  • WebRTC VideoTrackGenerator (1749533)

DOM

  • more characters for element and attribute names in methods (1773312)
    • Document.createAttribute(), Document.createAttributeNS(), Document.createElement(), Document.createElementNS()
    • Element.toggleAttribute(), Element.setAttribute(), Element.setAttributeNS()
    • DOMImplementation.createDocument()
    • customElements.define(), customElements.whenDefined()
  • ariaNotify() method on Document and Element (2018095)
  • CloseWatcher interface (1966073)
  • CSSFontFaceDescriptors interface (2019904)
  • Document.caretPositionFromPoint() including argument options.shadowRoots (1550635, 1914596)
  • Document.execCommand() "paste" command in web content (1998195)
  • HTMLSelectElement.showPicker() support list of options in <datalist> (1998668)
  • ...

JS

  • CSS module scripts (1986681)
  • islamic-umalqura calendar support in Intl (2011505)
  • Iterator.concat() method (1986672)
  • Iterator.zip() and Iterator.zipKeyed() static methods (2003333)
  • ...

APIs

  • CompressionStream and DecompressionStream support Brotli compression (1921583)
  • Document.activeViewTransition property (2001836)
  • Document Picture-in-Picture API (1858562)
  • HTML Sanitizer API (1650370)
    • setHTML()
  • Location.ancestorOrigins property (1085214)
  • Navigation API (1997962)
    • NavigationPrecommitController.addHandler() (2009004)
  • options.resizeQuality parameter support in Window.createImageBitmap() and WorkerGlobalScope.createImageBitmap() (2010125)
  • pointerrawupdate event movementX and movementY properties (1987671)
  • Reporting API (1976074, 2008916)
    • CSPViolationReport and IntegrityViolationReport objects using a ReportingObserver, can be filtered on type "csp-violation" or "integrity-violation"
  • Trusted Types API (1994690)
  • ...

Add-on gated:

Add-ons

  • split view support (1993037)
  • tabId parameter support in action.isEnabled and browserAction.isEnabled (2013477)
  • ...

WebDriver

  • browser.setDownloadBehavior command (1989022)
  • browsingContext.getTree command now accepts the vendor specific moz:scope (1944568, 1944570)
  • input.fileDialogOpened event (1855045)
  • emulation.setScreenSettingsOverride command (2000651)
  • script.realmCreated and script.realmDestroyed events (1936770)
  • ...

Marionette:

  • Reporting:GenerateTestReport command (1909662)
  • implicit and pageLoad timeouts supported in line with script timeout; null values to disable the timeouts (2008345)
  • ...

Protocols

HTTP

  • ...

Security

  • ...

Interop

Interop 2026 (2018559)

Interop Focus Areas for implementation:

Prototyping

We have plans to prototype the following but no commitment (nor official "intent") to ship yet. Alphabetical, no indication of ordering of implementation or consideration for shipping.

  • Fullscreen Keyboard Lock (700123)
  • ...

Add-on gated:

Specifications and Notes

Edit and publish new and updated specifications and notes. See Standards for our ongoing work in this area.

  • ...

See Also

Retrieved from "https://wiki.mozilla.org/index.php?title=Platform/Roadmap2026&oldid=1257497"