Platform/Roadmap2026

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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)
  • ...

CSS

  • units: rcap, rch, rex, ric (1740584)
  • <attr-type> values in attr() function (1986631, 1998245)
  • color-mix() function multiple color arguments (2007772)
  • shape() function on by default (1982941)
  • :buffering, :muted, :paused, :playing, :seeking, :stalled, :volume-locked allow you to style <audio> <video> elements (1707584, 2014512)
  • ::before and ::after on replaced elements (1931309)
  • ::marker pseudo-element support counter-increment, counter-reset, counter-set, quotes properties (2000404)
  • @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)
  • 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)
  • 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()
  • CloseWatcher interface (1966073)
  • 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=1256982"