Web platform features explorer

📃 November 2012 release notes

New in Chrome

The following features are now available in Chrome:

  • overflow-wrap: The overflow-wrap CSS property breaks a line of text onto multiple lines inside the targeted element in an otherwise unbreakable place to prevent overflow. The legacy property is word-wrap.
  • Text tracks: The <track> element is used as a child of the media elements that lets you specify a timed text track to be displayed in parallel with the media element.
  • Time-relative pseudo-selectors: The :past and :future CSS pseudo-classes match prior or upcoming text track cues during media playback.
  • WebVTT: WebVTT is a captions and subtitles format. WebVTT files are loaded using the <track> element, and the VTTCue API can be used to create or update cues dynamically.
  • WebVTT cue settings: The VTTCue API updates various aspects of cues dynamically, such as alignment, size and position.

New in Firefox

The following features are now available in Firefox:

  • Sandboxed iframes: The sandbox attribute for the <iframe> HTML element sets many security restrictions on the iframe, such as preventing form submissions or opening modal dialogs. Optional allow- values relax specific restrictions.
  • String startsWith() and endsWith(): The startsWith() and endsWith() methods of strings returns whether a search string appears at the beginning or end of the provided string.
  • Wheel events: The wheel event fires when the user moves a mouse wheel or similar spatially rotating input device.

New in Firefox for Android

The following features are now available in Firefox for Android:

  • Sandboxed iframes: The sandbox attribute for the <iframe> HTML element sets many security restrictions on the iframe, such as preventing form submissions or opening modal dialogs. Optional allow- values relax specific restrictions.
  • String startsWith() and endsWith(): The startsWith() and endsWith() methods of strings returns whether a search string appears at the beginning or end of the provided string.
  • Wheel events: The wheel event fires when the user moves a mouse wheel or similar spatially rotating input device.