Firefox 45 for developers

安装Firefox开发者版本,
以便测试Firefox最新的功能

Firefox 45，基于 Gecko 45, 将会在 March 2016 正式发布。本文记录了开发者们应该注意的,该版本的 Firefox 的各种变化。

针对网络开发者的功能更新

开发工具

没有功能更新.

HTML

• 现在可以在<meta>上直接设置内容安全策略(Content Security Policy)。 (bug 663570).
• The attribute referrer has been renamed into referrerpolicy on <image>, <area>, <a>, and <iframe> (bug 1187357).
• Changes in the viewport, or a resize, now trigger the reselection of responsive images for <img srcset> (bug 1166138).
   

CSS

• word-spacing now allows percentage values (bug 1038663).
• The inline-start and inline-end values have been added to float and clear (bug 1122918). They are enabled by default on Nightly and Aurora (Dev edition), as well as on Firefox OS; to activate it on a release or beta version, you need to flip the layout.css.float-logical-values.enabled to true.
• The text-emphasis, text-emphasis-style, text-emphasis-color, and text-emphasis-position have been implemented; they are disabled by default (set layout.css.text-emphasis.enabled  to true to activate them (bug 1040668).
• Alias -webkit-transform related CSS properties (bug 1179444).
• Support -webkit-min-device-pixel-ratio in CSS media queries (nonstandard version of "min-resolution") (bug 1176968).
• Remove pref layout.css.ruby.enabled (bug 1202940).
•  [css-grid][css-flexbox] Implement grid/flex layout for <fieldset> (bug 1230207).
• Support -webkit-box styling, as aliases for modern CSS flexbox (behind a pref) (bug 1208635).
• Our implementation of CSS Grids has been improved and is no more considered experimental; it is now activated by default (bug 1000592):
  • Gutters, that is the grid-column-gap, grid-row-gap, and grid-gap properties are now supported (bug 1176792).
  • The implied minimum size of grid Items, that is the special min-width and min-height auto behavior has been implemented (bug 1176775).
  • align-self and justify-self are now supported on grid layouts (bug 1151213).
  • align-content and justify-content are now supported on grid layouts (bug 1151214).

JavaScript

• ES2015 (ES6) Classes are now enabled by default (bug 1197932).
• Expression closures are deprecated and will now present a warning in the console (bug 995610).
• String.prototype.replace does not restore RegExp static properties after executing function parameter anymore (bug 1226936).
• Math.random() has been updated to the better XorShift128+ algorithm (bug 322529).

Interfaces/APIs/DOM

DOM & HTML DOM

• For compatibility the non-standard property Node.innerText has been implemented (bug 264412).
• <img srcset> now reacts to resize/viewport changes (bug 1166138).

WebGL

Our implementation of WebGL2 have been extended:

• Support of programs and shaders has been added (bug 1048743).
• Support for uniforms and attributes has been added (bug 1048745).
• Framebuffer objects have been implemented (bug 1048732).
• Renderbuffer objects have been implemented (bug 1048733).

IndexedDB

No change.

Service Workers

• Clients.get() and FetchEvent.clientId have been implemented (bug 1222464.)
• Clients.openWindow() has been implemented (bug 1172870.)
• The options object that can be passed as a parameter when invoking Clients.matchAll() can now include an includeUncontrolled property. This is a Boolean — if set to true, the matching operation will return all service worker clients who share the same origin as the current service worker. Otherwise, it returns only the service worker clients controlled by the current service worker. The default is false.

WebRTC

No change.

New APIs

No change.

Miscellaneous

• Web Speech Synthesis API has been implemented on Firefox Desktop (bug 1003439).
• The Window.onstorage event handler property has been added.
• The interface ComputedTiming have been added to our experimental implmenation of Web Animations API (bug 1108055).
• The Document.onselectionchange event handler property has been added (bug 1231193).
• The Performance.translateTime() has been implemented (bug 1169068).

MathML

No change.

SVG

• SVG stroke hit-testing is buggy when cairo is the Moz2D backend (bug 676001).
• Unable to interact with elements who have large transform / translate values (bug 1217012).

Audio/Video

• Fixed: Regression (since Firefox 41) whereby audio playback was stuttering due to duration time rounding errors (bug 1222866.)

HTTP

No change.

Networking

No change.

Security

• Support of the child-src CSP policy directive has been implemented (bug 1045891).
• EV certificates with a validity greater than 27 months are now considered and handled as DV certificates (bug 1222903).

Changes for add-on and Mozilla developers

Interfaces

No change.

XUL

• Tab Groups have been removed.

JavaScript code modules

No change.

XPCOM

No change.

Other

• WebIDL constructors could be called without the new operator in chrome context..  Now such code will raise a TypeError like in Web content since Firefox 30. For example, var req = XMLHttpRequest(); need to be var req = new XMLHttpRequest();.

See also

• Site Compatibility for Firefox 45

Older versions