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Firefox 25 release notes for developers

files/en-us/mozilla/firefox/releases/25/index.md

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Changes for web developers

New in Firefox DevTools

  • The inspector now features autocompletion for CSS names and values.
  • The debugger now lets you "black box" script files, to prevent breakpoints from stopping in library code you're not interested in debugging.
  • The Profiler can now save and import profiling results. "Show Gecko Platform Data" is now an option in the Firefox DevTools options.
  • The Network panel has a right-click context menu, with copy and resend URL commands.
  • Numerous under-the-hood changes may make some rewriting necessary for add-ons that modify the DevTools.

CSS

  • The support for the keyword local as a value of the {{cssxref("background-attachment")}} CSS property has been added (Firefox bug 483446).
  • Support for a non-standard Mozilla-only media query to determine the operating system version has been added: -moz-os-version (Firefox bug 810399). The property is currently only implemented on Windows.
  • The -moz-osx-font-smoothing CSS property has been added (Firefox bug 857142).
  • Our experimental support for {{cssxref("filter")}} now supports the hue-rotate() functional notation (Firefox bug 897392). It is still disabled by default.
  • page-break-inside: avoid is now working with the height of a block (Firefox bug 883676).

HTML

  • The srcdoc attribute of {{HTMLElement("iframe")}}, allowing the inline specification of the content of an {{HTMLElement("iframe")}}, is now supported (Firefox bug 802895).
  • When used with a "image/jpeg" type, the method HTMLCanvasElement.toBlob now accepts a third attribute defining the quality of the image (Firefox bug 891884).

JavaScript

ECMAScript 2015 implementation continues!

  • The method {{jsxref("Array.of()")}} is now implemented on Array (Firefox bug 866849).
  • Support for the methods {{jsxref("Array.prototype.find()")}} and {{jsxref("Array.prototype.findIndex()")}} has been added (Firefox bug 885553).
  • The methods {{jsxref("Global_Objects/Number/parseInt", "Number.parseInt()")}} and {{jsxref("Global_Objects/Number/parseFloat", "Number.parseFloat()")}} have been implemented (Firefox bug 886949).
  • The methods {{jsxref("Map.prototype.forEach()")}} and {{jsxref("Set.prototype.forEach()")}} are now implemented (Firefox bug 866847).
  • New mathematical methods have been implemented on Math: Math.log10(), Math.log2(), Math.log1p(), Math.expm1(), Math.cosh(), Math.sinh(), Math.tanh(), Math.acosh(), Math.asinh(), Math.atanh(), Math.trunc(), Math.sign() and Math.cbrt() (Firefox bug 717379).
  • Support for binary and octal integer literals has been added: 0b10101010, 0B1010, 0o777, 0O237 are now valid (Firefox bug 894026).
  • The machine epsilon constant, that is the smallest representable number that, when added to 1, does not equal 1, is now available as {{jsxref("Global_Objects/Number/EPSILON", "Number.EPSILON")}} (Firefox bug 885798).
  • Typed arrays have been updated to no longer search in the prototype chain for indexed properties (Firefox bug 829896).

Interfaces/APIs/DOM

  • The Web Audio API is now supported. An incomplete implementation was previously available behind a preference (Firefox bug 779297).
  • Some IME-related keys on Windows are supported by KeyboardEvent.key (Firefox bug 865565), see the key name table for details.
  • Firefox for Metro now dispatches key events in the same way as the desktop version (Firefox bug 843236).
  • keypress event is no longer dispatched if preventDefault() of preceding keydown event is called (Firefox bug 501496).
  • Renamed the Future interface to Promise (Firefox bug 884279).
  • The srcDoc property on the {{domxref("HTMLIFrameElement")}} interface, allowing the inline specification of the content of an {{HTMLElement("iframe")}}, is now supported (Firefox bug 802895).
  • The createTBody() method on the {{domxref("HTMLTableElement")}} interface, allowing retrieval of its {{HTMLElement("tbody")}}, is now supported (Firefox bug 813034).
  • The {{domxref("Range.collapse()")}} method toStart parameter is now optional and defaults to false, as defined in the spec (Firefox bug 891340).
  • Support for the ParentNode mixin on {{domxref("Document")}} and {{domxref("DocumentFragment")}} has been added (Firefox bug 895974).
  • The previousElementSibling and nextElementSibling have been moved to the ChildNode mixin allowing them to be called not only on an {{domxref("Element")}} object but also on a {{domxref("CharacterData")}} or {{domxref("DocumentType")}} object (Firefox bug 895974).
  • The navigator.geolocation property has been updated to match the spec. It never returns null. When the preference geo.enabled is set to false, it now returns undefined (Firefox bug 884921).
  • The videoPlaybackQuality attribute on the {{domxref("HTMLVideoElement")}} interface has been changed to the getVideoPlaybackQuality method. (Firefox bug 889205)
  • The non-standard GlobalObjectConstructor interface has been removed (Firefox bug 898136). This interface was used to add arguments to the constructors of APIs that Firefox add-ons were exposing on the global object. This capability has been removed; note that at this time there's no replacement for this functionality.

MathML

No change.

SVG

No change.