Firefox 56 for developers

Засоби розробника

Без змін.

HTML

• Реалізована властивість labels для елементів форми, які можуть мати мітки, наприклад HTMLInputElement.labels (en-US) (bug 556743).
• Реалізовано <link rel="preload">; див. Preloading content with rel="preload" для деталей (bug 1222633).

CSS

• Implemented the proprietary Mozilla-specific <color> (en-US) values -moz-win-accentcolor and -moz-win-accentcolortext (see bug 1344910), and the proprietary media query -moz-windows-accent-color-in-titlebar (see bug 1379938).

SVG

No changes.

JavaScript

• The Intl API has been enabled on Firefox for Android (bug 1344625).

APIs

New APIs

No changes.

DOM

• On Mac, Document.hidden (en-US) is now true when the window is behind another non-translucent application bug 1236512.
• The Gamepad.displayId (en-US) property has been implemented (bug 1375816).
• The CanvasRenderingContext2D.drawImage() (en-US) method has been updated so that smoothing occurs when downscaling even if imageSmoothingEnabled is false. This is not mandatory as per spec, but follows Chrome's behaviour. See bug 1360415.
• The PerformanceTiming.secureConnectionStart (en-US) property has been implemented (bug 772589).
• Firefox used to accept iso-2022-jp-2 sequences silently when an iso-2022-jp TextDecoder() (en-US) was instantiated, however this has now been removed to simplify the API, as no other browsers support it and no pages seem to use it. (bug 715833).
• The 4ms clamping behaviour of setTimeout() and setInterval() (en-US) has been updated to be more in line with other browsers, as described in Timeouts throttled to >=4ms (bug 1378586).
• The Page Visibility API's Document.onvisibilitychange (en-US) handler has been added (bug 1333912).

DOM events

• GlobalEventHandlers.onwheel (en-US) is now available on HTMLElement — it wasn't before (bug 1370550).

WebRTC

• Firefox now supports the RTCPeerConnection (en-US) properties which let you examine the current and pending configurations of the local and remote ends of the connection, to help manage changes in configuration: currentLocalDescription (en-US), pendingLocalDescription (en-US), currentRemoteDescription (en-US), and pendingRemoteDescription (en-US).

Security

No changes.

Plugins

No changes.

Other

• Gecko now encodes URLs internally as punycode, to avoid URL encoding problems (see bug 945240, also see discussion in bug 942074).
• Firefox on Windows and Mac OS X can now be made to run in headless mode using the -headless flag (see bug 1355150 and bug 1355147).

Removals from the web platform

HTML

• The <isindex> (en-US) element has been removed from the HTML parser, and from form submission (bug 1266495).
• The <applet> (en-US) element has been removed (bug 1279218).

APIs

• The KeyframeEffectReadOnly.spacing property has been removed from the Web Animations spec, and therefore has been removed from Gecko as well (bug 1339690).

SVG

No changes.

Changes for add-on and Mozilla developers

WebExtensions

No changes.

See also

• Site Compatibility for Firefox 56