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• Latest browser releases:
• Chrome 137
• Chrome Android 137
• Edge 137
• Firefox 139
• Firefox for Android 139
• Safari 18.5
• Safari on iOS 18.5

New features in Firefox 139 (released on 2025-05-27)

• hidden="until-found"

  Limited availability

  Tags: api html Groups: HTML

  The hidden="until-found" attribute hides an element until it is found using the browser's find-in-page search or it is directly navigated to by following a URL fragment.

  Baseline availability blocked since May 2025 by Safari (1 months)

  Learn more

  • Chrome 102 Released on 2022-05-24
  • Chrome Android 102 Released on 2022-05-24
  • Edge 102 Released on 2022-05-31
  • Firefox 139 Released on 2025-05-27
  • Firefox for Android 139 Released on 2025-05-27
  • Safari ❌
  • Safari on iOS ❌

• dialog.requestClose()

  Newly available since 2025-05-27

  Tags: api Groups: HTML > HTML elements

  The requestClose() method of a <dialog> HTML element closes the dialog, firing a cancel event first, which listeners can use to prevent the dialog from closing. This differs from the close() method, which only fires the non-cancelable close event.

  Learn more

  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge 134 Released on 2025-03-06
  • Firefox 139 Released on 2025-05-27
  • Firefox for Android 139 Released on 2025-05-27
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• Temporal

  Limited availability

  Tags: javascript Groups: JavaScript

  The Temporal API allows you to work with dates, times, time zones, and durations. It is more powerful than the Date API.

  Learn more

  • Chrome ❌
  • Chrome Android ❌
  • Edge ❌
  • Firefox 139 Released on 2025-05-27
  • Firefox for Android 139 Released on 2025-05-27
  • Safari ❌
  • Safari on iOS ❌