Firefox 56 for developers

Зміни для розробників Web

Засоби розробника

Без змін.

HTML

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

CSS

• Implemented the proprietary Mozilla-specific <color> 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 is now true when the window is behind another non-translucent application bug 1236512.
• The Gamepad.displayId property has been implemented (bug 1375816).
• The CanvasRenderingContext2D.drawImage() 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 property has been implemented (bug 772589).
• Firefox used to accept iso-2022-jp-2 sequences silently when an iso-2022-jp TextDecoder() 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() 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 handler has been added (bug 1333912).

DOM events

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

WebRTC

• Firefox now supports the RTCPeerConnection 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, pendingLocalDescription, currentRemoteDescription, and pendingRemoteDescription.

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