Firefox 41 for developers

Highlights:

• Take a screenshot of a DOM node
• Copy as HAR/save as HAR
• "Add Rule" button in the Rules view
• View source in a tab (Disabled by default)
• More options to copy CSS rules
• Copy image as data: URI in the Rules view
• Added command to GCLI to display CSP info

All devtools bugs fixed between Firefox 40 and Firefox 41: note that many of these bugs, especially those relating to the performance tools, were uplifted to Firefox 40.

• Support for laying out vertical scripts has been activated by default (Firefox bug 1138384). That means that the following CSS properties are now available:

  • Choosing the direction of writing: writing-mode.
  • Controlling orientation of characters: text-orientation.
  • Direction-independent equivalents of width and height: block-size and inline-size.
  • Direction-independent equivalents of min-width and min-height: min-block-size and min-inline-size.
  • Direction-independent equivalents of max-width and max-height: max-block-size and max-block-size.
  • Direction-independent equivalents of margin-top, margin-right, margin-bottom and margin-left: margin-block-start, margin-block-end, margin-inline-start and margin-inline-end.
  • Direction-independent equivalents of padding-top, padding-right, padding-bottom and padding-left: padding-block-start, padding-block-end, padding-inline-start and padding-inline-end.
  • Direction-independent 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.
  • Direction-independent equivalents of top, right, bottom and left: offset-block-start, offset-block-end, offset-inline-start and offset-inline-end.

• Support the transform-origin property in SVG and implement the transform-box property (Firefox bug 923193).

• <a> 没有 href 属性，并且不再被分类为交互内容。点击 <label> 将会激活标签内容 (Firefox bug 1167816).
• SVG 图标现在支持站点图标 (偏爱图标和快捷方式图标)(Firefox bug 366324).
• The crossorigin attribute is now supported for <link rel='preconnect'> (Firefox bug 1174152).
• The picture element does not react to resize/viewport changes (Firefox bug 1135812).

• Date.prototype现在是一个普通对象，不再是一个 Date 实例 (Firefox bug 861219).
• Date.prototype.toString 现在是一般方法 (Firefox bug 861219).
• Symbol.species被增加到 (Firefox bug 1131043).
• Map[@@species] 和Set[@@species] 获取已经被增加 (Firefox bug 1131043).
• 非标准 let expression 支持已经被废弃 (Firefox bug 1023609).
• Destructured parameters with default value assignment 现在已经被支持 (Firefox bug 1018628).
• Per ES2015, 方法定义 需要尖括号。从现在开始语法没有尖括号将会失败 (Firefox bug 1150855).
• 方法定义 (除了生成方法) 已经不再可构造 (Firefox bug 1059908 和Firefox bug 1166950).
• As part of ES2015 specification compliance, parenthesized destructuring patterns, like ([a, b]) = [1, 2] or ({a, b}) = { a: 1, b: 2 }, are now considered invalid and will throw a SyntaxError. See Jeff Walden's blog post for more details.
• The new.target syntax has been added (Firefox bug 1141865).

• 剪切、复制和粘贴命令处理已经被重新编码，并且现在允许 JS 编程实现网页内容复制和剪切。

  • 使用 'paste'名利作为参数，Document.queryCommandSupported()现在会返回 false 如果不充分的权限被执行 (Firefox bug 1161721).
  • 使用'cut' 或 'copy' 命令作为参数，Document.queryCommandSupported() 现在返回true 如果调用的上下文中包括用户发起的或特权代码 (Firefox bug 1162952).
  • 使用 'cut' 或'copy' 命令作为参数，Document.execCommand() 将会执行，但是仅仅在用户发起的或特权代码的上下文下 (Firefox bug 1012662).

Events

• 非标准的CloseEvent.initCloseEvent() 方法和创建 CloseEvent 使用 Event.createEvent('CloseEvent') 方法已经被移除。相反可以使用标准的构造器CloseEvent() . (Firefox bug 1161950).
• On Desktop, PointerEvent is now activated by default in Nightly; it is not activated in Developer Edition, Beta or Release and won't be for at least some versions (Firefox bug 1166347).
• The unprefixed version of MouseEvent.movementX and MouseEvent.movementY have been added; the prefixed versions are deprecated and will be removed at some point in the future (Firefox bug 1164981).

Web Crypto

• SubtleCrypto.importKey() 和SubtleCrypto.exportKey() 现在支持 ECDH keys (Firefox bug 1050175).

Canvas API

• HTMLCanvasElement.captureStream() and CanvasCaptureMediaStream have been added and allow to stream the display of a <canvas> in real-time (Firefox bug 1032848).
• MediaStream.id now returns the unique id of a stream (Firefox bug 1089798).
• The initial value of CanvasRenderingContext2D.filter is now correctly set to none (Firefox bug 1163124).

Service Workers

• Improvement to our experimental Service Worker implementation:

  • ServiceWorkerGlobalScope.skipWaiting() has been implemented (Firefox bug 1131352).
  • Clients.claim() has been added (Firefox bug 1130684).
  • The other functional events of Service Workers have been made to inherit from ExtendableEvent, giving them access to the waitUntil() method (Firefox bug 1160527).

• The CacheStorage and Cache interfaces are now supported (Firefox bug 1110144).

WebGL

• The failIfMajorPerformanceCaveat WebGL context attribute has been added and can be set when creating a WebGL context with HTMLCanvasElement.getContext() to indicate if a context creation should fail if the system performance is low (Firefox bug 1164970).

WebRTC

• Firefox no longer offers a default STUN server to be used if none are specified when constructing a new RTCPeerConnection. You'll need to provide one in order to successfully establish a WebRTC connection.

Miscellaneous

• On OS X and Windows, Navigator.onLine now changes regarding network connectivity (it always returned true, , unless "Work offline" mode was selected) before (Firefox bug 654579).
• MessagePort and MessageChannel now available in Web workers, and are enabled by default in all contexts (Firefox bug 952139) and (Firefox bug 911972).
• The User Timing API is now available in Web workers (Firefox bug 1155761).
• The Notifications API is now available in Web workers (Firefox bug 916893).
• DOMRequest and DOMCursor are now available in Web workers (Firefox bug 1167650).
• The CSS Font Loading API has been completely implemented and is now enabled by default (Firefox bug 1149381).
• Shared workers can no longer be shared between private (i.e. browsing in a private window) and non-private documents (see Firefox bug 1177621).
• The URLUtilsSearchParams.searchParams property is now read-only (Firefox bug 1174731).
• The URLUtils.hash property no longer decodes URL fragment (Firefox bug 1093611).

新的默认、支持字体处理

数学公式需要特殊的字体。到目前为止，这些字体被硬编码在用户默认样式 mathml.css (使用<math> 标志设置字体组) 和偏好选项font.mathfont-family (为拉伸和大操作数设置支持字体). Firefox 41 引入一个能够自动设置<math>标志和相应偏好选项的内置x-math 语言 (例如font.name.serif.x-math). 用户默认样式现在将<math>标志字体设置为 serif 并且font.mathfont-family 被替换为 font.name.serif.x-math. 所有平台现在基本使用相同列表的支持字体， "Latin Modern Math" 是首选。在标准的 per-language 字体偏好菜单中，默认支持字体能够被设置。更多细节，请参照Firefox bug 947654 和 Firefox bug 1160456.

• 站点图片 (偏爱图标，快捷方式图标) 现在支持 SVG(Firefox bug 366324)

• The media.autoplay.enabled preference now also apply to untrusted HTMLMediaElement.play() invocations too, that is calls from non-users activated scripts (Firefox bug 659285).

• The X-Content-Duration header is no longer supported (Firefox bug 1160695).
• Draft versions of the HTTP/2 protocol are no more supported (Firefox bug 1132357).

• The CSP 1.1 manifest-src directive 已经被支持 (Firefox bug 1089255).
• Previous versions of Firefox incorrectly expected the Content Security Policy referrerdirective's value origin-when-cross-origin to be spelled origin-when-crossorigin. This has been corrected to include the missing dash character.

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• A new, internal, and chrome-context-only API to render the root widget of a window into a <canvas> has been added: CanvasRenderingContext2D.drawWidgetAsOnScreen(). This API uses the operating system to snapshot the widget on-screen. For more details see Firefox bug 1167477.

• Site Compatibility for Firefox 41