Platform/Roadmap2026

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Platform 2026 Roadmap

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

Related Links:

• Firefox Release Calendar (future)
• Firefox release notes for developers (past)
• Pocket Guide: Shipping Firefox

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:

• https://developer.mozilla.org/en-US/docs/Web/

HTML

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CSS

• units: rcap, rch, rex, ric (1740584)
• ::before and ::after on replaced elements (1931309)
• ::marker pseudo-element support counter-increment, counter-reset, counter-set, quotes properties (2000404)
• 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)
• CSS properties and rendering of <fieldset> and <legend> (1935129)
  • margins, generated content, custom display values
• View transition types (2001878)
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WebCompat:

• -webkit-perspective property (1362499)
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CSSOM

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SVG

• SVG URL media fragments (1999989)
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Rendering

WebGPU:

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Media

Including Media-related APIs like WebRTC

• WebRTC MediaStreamTrackProcessor (1749532)
• WebRTC VideoTrackGenerator (1749533)

DOM

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JS

• CSS module scripts (1986681)
• Iterator.concat() method (1986672)
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APIs

• Document.activeViewTransition property (2001836)
• CompressionStream and DecompressionStream support Brotli compression (1921583)
• Navigation API (1997962)
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Add-ons

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WebDriver

• input.fileDialogOpened event (1855045)
• emulation.setScreenSettingsOverride command (2000651)
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Protocols

HTTP

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Security

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Interop

Interop 2026 (2018559)

• Our announcement blog post: https://hacks.mozilla.org/2026/02/launching-interop-2026/

Interop Focus Areas for implementation:

• 2017321: CSS Anchor Positioning
• 2017328: CSS attr()
• 2017330: CSS contrast-color
• 2017331: Container style queries
• 2017332: Custom highlights
• 2017335: Dialogs and Popovers
• 2017337: Fetch
• 2017340: IndexedDB
• 2017341: JSPI for WASM
• 2017344: Navigation
• 2017353: Scoped custom element registries
• 2017354: Scroll-driven animations
• 2017355: scroll-snap
• 2017356: CSS shape
• 2017359: View transitions
• 2017360: zoom
• 2017361: Web compat
• 2017363: WebRTC
• 2017364: WebTransport

Specifications and Notes

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

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See Also

• Platform
• Previously: Platform/Roadmap2025
• Next: Platform/Roadmap2027