Mozilla Firefox 38.0 Beta 5 今日发布，该版本将在今年5月份正式发布。除了继续优化对64位的支持外，最大的改进是原生支持Ruby字符。Ruby字符与Ruby语言无关，而是注音标示，是一种表意文字的音标印刷方式，广泛地运用于日文及中文，rubi是日本印刷业的用语。以前 Firefox浏览器支持注音标示需要安装扩展如HTML Ruby，如今Firefox 38默认启用了CSS Ruby，同时还引入了HTML5 ruby标签支持。

下载地址:

http://dm-download02.mozilla.org/pub/mozilla.org/mozilla.org/firefox/releases/38.0b4/

Developer Tools

Highlights:

• Bypass audio nodes in Web Audio Editor

• "copy" command in Web Console

• Highlight and filter XmlHttpRequests in Web Console

• See optimized-out variables in the Debugger

• See security warnings in the Network Monitor

• See transferred sizes in the Network Monitor

• Play/pause all animations in the page

All devtools bugs fixed between Firefox 37 and Firefox 38.

CSS

• Support for ruby-position and ruby-align have been added and is available by default (bug 1055676bug 1123917 and bug 1039006).

• The :unresolved pseudo-class have been implemented for custom elements (bug 1111633).

• The predefined style ethiopic-numeric now uses a space, instead of a dot, as suffix to match a recent change to the spec (bug 1120721).

• CSS transitions on generated content (with ::before and ::after) on both an inline and the block that splits them now start as expected by the spec (bug 1110277).

• The implementation of CSS Logical Properties made big progress. The following properties are available behind the layout.css.vertical-text.enabled flag (false by default):

• Direction-independant equivalents of width and height: block-size and inline-size (bug 1117983).

• Direction-independant equivalents of min-width and min-height: min-block-size and min-inline-size (bug 1117983).

• Direction-independant equivalents of max-width and max-height: max-block-size and max-block-size (bug 1117983).

• Direction-independant equivalents of margin-top, margin-right, margin-bottom and margin-left: margin-block-start, margin-block-end, margin-inline-start and margin-inline-end (bug 649142).

• Direction-independant equivalents of padding-top, padding-right, padding-bottom and padding-left: padding-block-start, padding-block-end, padding-inline-start and padding-inline-end (bug 649142).

• Direction-independant equivalents of border-top, border-right, border-bottom and border-left and their longhands for width, style and color: border-block-start, border-block-start-width, border-block-start-style, border-block-start-color, border-block-end, border-block-end-width, border-block-end-style, border-block-end-color, border-inline-start, border-inline-start-width, border-inline-start-style, border-inline-start-color, border-inline-end, border-inline-end-width, border-inline-end-style and border-inline-end-color (bug 649142).

• Direction-independant equivalents of top, right, bottom and left: offset-block-start, offset-block-end, offset-inline-start and offset-inline-end (bug 1120283).

• How CSS Transitions start has been modified to match a recent change of the specifications, aiming at having an interoperable behavior between browsers (bug 960465).

HTML

• Label element doesn't dispatch event to label target element if interactive content is found between the event target and the label (bug 229925).

• The <picture> element has been activated by default (bug 1017875).

JavaScript

• Generator.prototype.return() is implemented (bug 1115868).

• Setter with a rest parameter is now a SyntaxError (bug 1089632).

• The name property of functions is configurable now (bug 1084019).

• Several Array methods have been implemented for typed arrays as well:

• The of() and from() methods (bug 896608).

• The forEach() method (bug 1107645).

• The filter() and map() methods (bug 1121936).

• The slice() method (bug 1121935).

• Duplicated parameter name is no longer allowed when rest-parameter is present (bug 1096376).

• Duplicated parameter name is no longer allowed in arrow functions (bug 1096377).

• Duplicated parameter name is no longer allowed in concise method definitions (bug 1096378).

• Warning is shown when Map/Set/WeakMap constructor is called without new (bug 1108930).

• When defining a generator method, "set" and "get" are no longer invalid names (bug 1073809).

• RegExp.prototype.source now returns "(?:)" instead of an empty string for empty regular expressions (bug 1130798).

• RegExp.prototype.source and RegExp.prototype.toString() now escape regular expression patterns properly (e.g. line terminators, "n") (bug 1130860).

• The Regexpglobal, ignoreCase, multiline, source, and sticky properties are now prototype accessor properties rather than own data properties of RegExp instances (bug 1120169).

• Function.prototype.toString() now throws for Proxy objects (bug 1100936).

Interfaces/APIs/DOM

• The Fetch API fetch() method has been implemented (bug 1039846).

• BroadcastChannel has been implemented (bug 966439 and bug 1121420).

• CanvasRenderingContext2D.clearHitRegions() has been implemented (bug 1119527).

• HTMLAnchorElement.hash, HTMLAreaElement.hash, Location.hash, WorkerLocation.hash, and URL.hash now returns a percent-encoded fragment (bug 1093611 & bug 1122948).

• Constants of KeyboardEvent.location, DOM_KEY_LOCATION_MOBILE and DOM_KEY_LOCATION_JOYSTICK, are dropped due to dropped from DOM Level 3 Spec (bug 936313.

• KeyboardEvent.code supports special keys on Sun keyboard on Linux, Android and Firefox OS. (bug 1020139)

• KeyboardEvent.code is enabled on release build. (bug 1126673)

• The TextEncoder() constructor has been changed to match the spec: when an invalid parameter is passed, the RangeError exception is now raised, rather than the erroneous TypeError (bug 1125766).

• The User Timing API, adding Performance.mark(), Performance.clearMarks(), Performance.measure(), and Performance.clearMeasures() has been implemented (bug 782751).

• The prefixed version of indexedDB, mozIndexedDB has been removed (bug 975699).

• The DOMContentLoaded event is no longer cancelable (bug 1134559).

• You can now use WebSockets in Workers (bug 1112054).

• The XMLHttpRequest.responseType and XMLHttpRequest.withCredentials properties can now be set before calling XMLHttpRequest.open() (bug 707484).

MathML

No change.

SVG

No change.

Audio/Video

No change.

Networking

No change.

Security

• In Firefox, the autocomplete=false attribute is now ignored when dealing with a login form (bug 1025703).

• RC4 is now disabled when using TLS, except for a few Web sites on a whitelist. This whitelist is an interim measure while the Web sites are fixed (bug 1124039).

• Web sites needing to fallback to an insecure version of TLS to work are now in a hardcoded whitelist, that will shrink with time (bug 1114816). The whitelist can be disabled by setting security.tls.insecure_fallback_hosts.use_static_list to false.

Changes for add-on and Mozilla developersAdd-on SDKHighlights

• sdk/context-menu@2 was implemented (bug 1070952).

• sdk/addon/bootstrap was implemented (bug 1075541).

• sdk/windows/loader was removed (bug 970135).

• Fix for default language detection on Linux (bug 1114712).

• toolkit/loader now has opt-in module compatibility checking, which is enabled for all jpm add-ons (bug 1037235).

E10S Updates

• sdk/page-worker e10s updates (bug 1116004).

• sdk/content/worker e10s updates (bug 1116544).

• sdk/tabs e10s updates (bug 1033838).

Details

• Github commits made between Firefox 37 and Firefox 38.

XUL

No change.

JavaScript code modulesDownloads.jsm

• DownloadTarget objects now have exists and size properties, allowing you to determine the existence of and the size of the download's target file on disk, as well as a new refresh() method, which asks that these values be updated.

XPCOM

• "@mozilla.org/network/atomic-file-output-stream;1" and "@mozilla.org/network/safe-file-output-stream;1" now throws an exception if PR_APPEND is passed without PR_TRUNCATE (bug 1117580).

• nsICompositionStringSynthesizer and nsIDOMWindowUtils.sendCompositionEvent() are now dropped. Instead, use nsITextInputProcessor. (bug 917322)

• nsIDOMWindowUtils.sendKeyEvent() is now deprecated. Instead, use nsITextInputProcessor. (bug 1119609)