Web platform features explorer

📃 January 2013 release notes

New in Chrome

The following features are now available in Chrome:

  • Intl: The Intl API provides language sensitive string comparison, number formatting, date and time formatting, and more.
  • mask-type: The mask-type CSS property on an SVG <mask> element sets whether the mask is a luminance or alpha mask.
  • OES_element_index_uint WebGL extension: The OES_element_index_uint extension for WebGL 1.0 contexts adds support for gl.UNSIGNED_INT types to WebGLRenderingContext.drawElements().
  • OES_vertex_array_object WebGL extension: The OES_vertex_array_object extension for WebGL 1.0 contexts adds vertex array objects (VAOs) which encapsulate vertex array states. These objects keep pointers to vertex data and names for different sets of vertex data.
  • requestAnimationFrame(): The requestAnimationFrame() method schedules a function that runs before the next repaint. You can use it to animate content with JavaScript.

New in Firefox

The following features are now available in Firefox:

  • devicePixelRatio: The window.devicePixelRatio property is the ratio of the size of one CSS pixel to the vertical size of one physical pixel on the current display device.
  • Page visibility: The document.visibilityState and document.hidden properties tell you whether the page is visible to the user (for example, it's not minimized or in a background tab).
  • Proxy and Reflect: The Proxy and Reflect JavaScript built-ins intercept and define custom behavior for fundamental language operations (such as property lookup, assignment, enumeration, or function invocation).

New in Firefox for Android

The following features are now available in Firefox for Android:

  • background-size: The background-size CSS property scales or stretches a background based on the size of the element (with the contain and cover keywords), a length, or percentage.
  • devicePixelRatio: The window.devicePixelRatio property is the ratio of the size of one CSS pixel to the vertical size of one physical pixel on the current display device.
  • Page visibility: The document.visibilityState and document.hidden properties tell you whether the page is visible to the user (for example, it's not minimized or in a background tab).
  • Proxy and Reflect: The Proxy and Reflect JavaScript built-ins intercept and define custom behavior for fundamental language operations (such as property lookup, assignment, enumeration, or function invocation).