Mozilla Firefox 40.0 Beta 6 发布 全新新标签页

　　Mozilla今日发布Mozilla Firefox 40.0的Beta 6版本，基于Gecko 40内核开发，新设计的标签页可以自动判断和展示您认为感兴趣的内容，广受期待的多进程特性目前还没有带来， 正式版本预计8月11日发布。

　　下载地址:

　　http://dm-download02.mozilla.org/pub/mozilla.org/mozilla.org/firefox/releases/40.0b6/

　　Changes for Web developersDeveloper Tools

　　Highlights:

　　Improvements to the Animations view

　　Get help from MDN for CSS property syntax

　　Edit filters in the Page Inspector

　　Web Console now shows messages from workers

　　Filter requests by URL in the Network Monitor

　　Many new context menu options in the Network Monitor

　　Show when network resources are fetched from the browser cache

　　Filter rules in the Page Inspector

　　More:

　　Break at debugger; statements in unnamed ｅｖａｌ sources

　　Copy URL/Open in New Tab context menu items for Debugger source list pane

　　console.dirxml support in the Web Console

　　Style Editor: "Open Link In New Tab" item added to stylesheet list

　　Inspector selector search now includes class/id results even without css prefix

　　Tooltips in box-model view saying which CSS rule caused the value

　　Switch between color unit format in the Inspector using Shift+click

　　Implement "Scroll Into View" menu item for the Inspector

　　Linkify url/id/resource attributes in the Inspector

　　IP address tooltip in the Network Monitor

　　Everything: all devtools bugs fixed between Firefox 39 and Firefox 40.

　　CSS

　　Prefixed rules (-moz-) for text-decoration-color, text-decoration-line, and text-decoration-style have been removed (bug 1097922).

　　The property text-align now supports the match-parent value (bug 645642).

　　In Quirks Mode, empty-cells now defaults to show, like in standard mode (bug 1020400).

　　The -moz-orient non-standard property, used to styleandelement has been adapted for vertical writing-modes: the value auto has been dropped and the values inline and block added, with inline being the new default value (bug 1028716).

　　HTML

　　No change.

　　JavaScript

　　Unreachable code after return statement (including unreachable expression after semicolon-less return statements) will now show a warning in the console (bug 1005110, bug 1151931).

　　Symbol.match has been added (bug 1054755).

　　Passing an object which has a property named Symbol.match with a truthy value to String.prototype.startsWith, String.prototype.endsWith, and String.prototype.contains now throws a TypeError (bug 1054755).

　　RegExp function returns pattern itself if called without new and pattern object has a property named Symbol.match with a truthy value, and the pattern object's constructor property equals to RegExp function. (bug 1147817).

　　Support for the non-standard JS1.7 destructuring for-in has been dropped (bug 1083498).

　　Non-standard initializer expressions in for...in loops are now ignored and will present a warning in the console. (bug 748550 and bug 1164741).

　　u{xxxxxx} Unicode code point escapes have been added (bug 320500).

　　String.prototype.contains has been replaced with String.prototype.includes, String.prototype.contains is kept as an alias (bug 1102219).

　　If the DataView constructor is called as a function without the new operator, a TypeError is now thrown as per the ES6 specification.

　　An issue regressed in Firefox 21, where proxyfied arrays without the get trap were not working properly, has been fixed. If the get trap in a Proxy was not defined, Array.length returned 0 and the set trap didn't get called. A workaround was to add the get trap even if was not necessary in your code. This issue has been fixed now (bug 895223).

　　WeakMap.prototype and WeakSet.prototype have been updated to be just ordinary objects, per ES6 specification (bug 1055473).

　　Interfaces/APIs/DOMNew APIs

　　The Push API has been implemented (bug 1038811).

　　Web Animations API

　　Improvement in our experimental Web Animations implementation, mostley to match latest spec changes:

　　AnimationPlayer.currentTime now can also be set (bug 1072037).

　　Animatable.getAnimationPlayers(), available on Element has been renamed to Element.getAnimations() (bug 1145246).

　　Animation and AnimationEffect have been merged into the newly created KeyframeEffectReadOnly (bug 1153734).

　　AnimationPlayer has been renamed to Animation (bug 1154615).

　　AnimationTimeline is now an abstract class, with DocumentTimeline its only implementation (bug 1152171).

　　CSSOM

　　The CSS Font Loading API is now enabled by default in Nightly and Developer Edition releases (bug 1088437). It is still deactivated by default in Beta and Release browsers.

　　The CSSCharsetRule interface has been removed and such objects are no longer available in CSSOM (bug 1148694). This matches the spec (recently adapted) and Chrome behavior.

　　WebRTC

　　WebRTC: the negotiationneeded event is now also sent for initial negotiations, not only for re-negotiations (bug 1149838).

　　DOM & HTML DOM

　　When unable to parse the srcset, the HTMLImageElement.currentSrc method doesn't return null anymore but "", as requested by the latest specification (bug 1139560).

　　Like for images, Firefox now throttle Window.requestAnimationFrame() for non-visible