• Filters:
• Newly available
• Widely available
• Limited availability
• One missing engine
• Discouraged
• All features

• Features only in:
• Chromium
• Firefox
• Safari

• Browser releases:
• Chrome 143
• Chrome Android 143
• Edge 143
• Firefox 146
• Firefox for Android 146
• Safari 26.3
• Safari on iOS 26.3

New features in Firefox 146 (released on 2025-12-09)

• contrast-color()

  Limited availability

  The contrast-color() CSS function picks a color that has guaranteed contrast against a specified foreground or background color.

  Learn more

  • Chrome ❌
  • Chrome Android ❌
  • Edge ❌
  • Firefox 146 Released on 2025-12-09
  • Firefox for Android 146 Released on 2025-12-09
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• @scope

  Baseline Newly Available (since 2025-12-09)

  The @scope CSS at-rule sets the scope for a group of rules.

  Learn more

  • Chrome 118 Released on 2023-10-10
  • Chrome Android 118 Released on 2023-10-10
  • Edge 118 Released on 2023-10-13
  • Firefox 146 Released on 2025-12-09
  • Firefox for Android 146 Released on 2025-12-09
  • Safari 17.4 Released on 2024-03-05
  • Safari on iOS 17.4 Released on 2024-03-05

• Relaxed-width SIMD (WebAssembly)

  Limited availability

  Relaxed SIMD (Single Instruction Multiple Data) introduces local non-determinism, where the results of the instructions may vary based on hardware support.

  Baseline availability blocked since December 2025 by Safari (0 months)

  Learn more

  • Chrome 114 Released on 2023-05-30
  • Chrome Android 114 Released on 2023-05-30
  • Edge 114 Released on 2023-06-02
  • Firefox 146 Released on 2025-12-09
  • Firefox for Android 146 Released on 2025-12-09
  • Safari ❌ Vendor position : neutral
  • Safari on iOS ❌ Vendor position : neutral