Mozilla Firefox 39.0 Beta 4 发布

Mozilla Firefox 39.0 Beta 4 今日发布于Mozila的FTP，目前官方还没有发布相关的更新报告，但从面向开发者的信息看，SSLv3被彻底移除出Firefox的支持范围，并实现对W3C制订的ARIA规范的支持，这是一个为残疾人士等提供无障碍访问动态、可交互Web内容的技术规范，为浏览器、媒体播放器、辅助技术的开发人员以及Web内容开发者定义了可以获得更广泛跨平台可访问性的方法。可见Firefox从现在开始对残障人士的会更加友好。

下载地址:

http://dm-download02.mozilla.org/pub/mozilla.org/mozilla.org/firefox/releases/39.0b4/

Changes for Web developersDeveloper Tools

Highlights:

All devtools bugs fixed between Firefox 38 and Firefox 39.

CSS

Support of the <string> type on list-style-type, as well as its shorthand propertylist-style has been implemented (bug 1144607).
CSS Scroll Snapping has been implemented (bug 945584 and bug 1138658).
Cascading of CSS Animations and CSS Transitions has been rewritten to match the latest specification (bug 1125455).
Support for vertical scripts, with the writing-mode is now turned on by default on Nightly and Developer Edition, but not on Firefox Beta and Firefox Release (bug 1099032). Note that implementation is not yet complete and some widgets, like tables, will not obey to all values.

HTML

A new ARIA role, switch, is now supported (bug 1136563).
Support for <link rel="preconnect"> allowing to anticipate a future connection without revealing any information has been implemented (<a class=”external external-icon” href=”https://bugzilla.mozilla.org/show_bug.cgi?id=1135160″ title=”FIXED: Implement” _href=”https://bugzilla.mozilla.org/show_bug.cgi?id=1135160″>bug 1135160).

JavaScript

The RegExp constructor no longer throws when the first argument is a RegExp and the second flags argument is present (bug 1108949).
The Object.prototype.__noSuchMethod__ property is now deprecated and throws a console warning (see bug 1140428 and this platform announcement).
The implementation of the Proxy object has been updated to comply more with the ES6 specification:
- The defineProperty and set handlers now need to explicitly return true to be successful, otherwise a TypeError exception will be thrown in strict mode (bug 1132522).
- If the window object is set as the target, those handlers will now throw a TypeError(bug 828137).
When using arrow functions (=>), a line terminator (\n) is no longer allowed after arrow function arguments (() \n => {}) (bug 1141392).
RegExp.prototype.toString is now a generic function (bug 1079919).
The non-standard flags argument ofString.prototype.match(), String.prototype.search(), and String.prototype.replace() is now deprecated and throws a console warning (bug 1142351).
The try/catch behavior of Object.assign() has been removed to conform with the latest ES6 draft (bug 1103344).

Interfaces/APIs/DOM

The experimental CanvasRenderingContext2D.addHitRegion() method now accepts a pathoption, which allows you to add hit regions to Path2D objects (bug 1129147).
New methods have been added to manipulate FormData objects (bug 1085283) andFormData are now supported in Web workers (bug 739173).
The non-standard XMLHttpRequest.sendAsBinary() method has been removed (bug 853162).
Progress in our experimental implementation of Web Animations:AnimationPlayer.startTime is now writeable (bug 1073379).
Progress in our experimental implementation of Service Workers: Cache andCacheStorage interfaces are now implemented (bug 940273).
The experimental Fetch API has been activated by default (bug 1133861).
Progress in our experimental implementation of WebGL2: WebGLSync is now implemented (bug 1048721).

MathML

No change.

SVG

No change.

Audio/Video

No change.

Miscelleanous

WOFF2 fonts support is now turned on by default in release version of Firefox (Beta and Release, in addition of Nightly and Developer Edition) (bug 1084026).

Networking