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

• Features only in:
• Chromium
• Firefox
• Safari

• Browser releases:
• Chrome
• Chrome Android
• Edge 146
• Firefox 149
• Firefox for Android 149
• Safari 26.4
• Safari on iOS 26.4

New features in Firefox 149 (released on 2026-03-24)

• captureStream() for <audio> and <video>

  Limited availability

  The captureStream() method for <audio> and <video> elements returns a MediaStream for the media element's content. You can use this to record media or send it elsewhere, such as a canvas or WebRTC connection.

  Baseline availability blocked since March 2026 by Safari (1 months)

  Learn more

  • Chrome 62 Released on 2017-10-17
  • Chrome Android 62 Released on 2017-10-24
  • Edge 79 Released on 2020-01-15
  • Firefox 149 Released on 2026-03-24
  • Firefox for Android 149 Released on 2026-03-24
  • Safari ❌
  • Safari on iOS ❌

• CloseWatcher

  Limited availability

  The CloseWatcher API listens and responds to close requests on in-page components, such as modals, popovers, and sidebars.

  Baseline availability blocked since March 2026 by Safari (1 months)

  Learn more

  • Chrome 126 Released on 2024-06-11
  • Chrome Android 126 Released on 2024-06-11
  • Edge 126 Released on 2024-06-13
  • Firefox 149 Released on 2026-03-24
  • Firefox for Android 149 Released on 2026-03-24
  • Safari ❌ Vendor position : neutral
  • Safari on iOS ❌ Vendor position : neutral

• Math font family

  Baseline Newly Available (since 2026-03-24)

  The font-family: math CSS declaration uses the browser default font face for displaying mathematical expressions.

  Learn more

  • Chrome 109 Released on 2023-01-10
  • Chrome Android 109 Released on 2023-01-10
  • Edge 109 Released on 2023-01-12
  • Firefox 149 Released on 2026-03-24
  • Firefox for Android 149 Released on 2026-03-24
  • Safari 26.2 Released on 2025-12-12
  • Safari on iOS 26.2 Released on 2025-12-12

• popover="hint"

  Limited availability

  The popover="hint" global HTML attribute creates a popover that is subordinate to popovers with a popover="auto" attribute. You can use this to create tooltips that don't dismiss auto popovers.

  Baseline availability blocked since March 2026 by Safari (1 months)

  Learn more

  • Chrome 133 Released on 2025-02-04
  • Chrome Android 133 Released on 2025-02-04
  • Edge 133 Released on 2025-02-06
  • Firefox 149 Released on 2026-03-24
  • Firefox for Android 149 Released on 2026-03-24
  • Safari ❌
  • Safari on iOS ❌

• Reporting API

  Baseline Newly Available (since 2026-03-24)

  The Reporting-Endpoints HTTP header and ReportingObserver() API send reports of Content Security Policy (CSP) violations, Permissions-Policy violations, deprecated feature usage, browser interventions, and crashes to a nominated URL or callback function.

  Learn more

  • Chrome 96 Released on 2021-11-15
  • Chrome Android 96 Released on 2021-11-15
  • Edge 96 Released on 2021-11-19
  • Firefox 149 Released on 2026-03-24
  • Firefox for Android 149 Released on 2026-03-24
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27