Firefox 50 for developers

Firefox 50, based on Gecko 50, will ship in November 2016. This article provides information about the changes in this release that will affect developers. Nightly builds of what will become Firefox 50 are currently available on the Developer Edition channel.

Mudanças para desenvolvedores web

Developer Tools

Nenhuma mudança.

HTML

• For compatibility purposes, the non-standard webkitdirectory attribute of the <input> element, as well as the property HTMLInputElement.webkitDirectory property, have been implemented (bug 1258489).
• The default style of <bdo> now has a unicode-bidi with the isolate-override value (bug 1249497).

CSS

• Border-radiused corner with dashed and dotted style is now rendered with specified style instead of solid style (bug 382721).
• The non-standard :-moz-full-screen-ancestor pseudo-class selector has been removed (bug 1199529).
• The box-sizing: padding-box has been removed, since it’s no longer a part of the spec and Firefox was the only major browser to implement it (bug 1166728).
• Our experimental implementation of mask-position now supports animation of this property (bug 1273804). It is still available only on Nightly.
• The three values isolate, isolate-override, and plaintext of the unicode-bidi have been unprefixed (bug 1141895).
• In quirk mode, the bullet of a list now inherit the size of the list, like in standard mode (bug 648331).
• Changed behavior of the :in-range and :out-of-range pseudo-classes to not match disabled or read-only inputs (bug 1264157).
• Unprefixed :any-link pseudo-class bug 843579.
• Implemented space value of border-image-repeat (bug 720531).

JavaScript

• The ES2015 Symbol.hasInstance property has been implemented (bug 1054906).
• The ES2017 Object.getOwnPropertyDescriptors() method has been implemented (bug 1245024).
• The behavior of \W in RegExp with unicode and ignoreCase flags is changed to match recent draft spec. Now it doesn't match to K, S, k, s, and KELVIN SIGN (U+212A), and LATIN SMALL LETTER LONG S (U+017F) (bug 1281739).

Interfaces/APIs/DOM

DOM & HTML DOM

• The HTMLInputElement.webkitdirectory property is now supported (bug 1258489).
• Support once option for EventTarget.addEventListener() (bug 1287706).

Canvas

No change.

WebGL

• The EXT_shader_texture_lod WebGL extension has been implemented (bug 1111689).

IndexedDB

No change.

Service Workers

• The WindowClient.navigate() method has been implemented. This method lets you open a specified URL into a client window which is being controlled by the service worker (bug 1218148).

WebRTC

• The RTCDataChannel.stream property has been removed. This was replaced with RTCDataChannel.id in Firefox 24, but was supported for backward compatibility. Please be sure to update your code to use the id property if you haven't done so yet.

New APIs

No change.

Others

• XMLHttpRequest.getResponseHeader() and XMLHttpRequest.getAllResponseHeaders() now also return empty headers by default. This can be controlled via the preference network.http.keep_empty_response_headers_as_empty_string (bug 918721).

MathML

No change.

SVG

No change.

Audio/Video

No change.

HTTP

• The experimental (and deprecated) SPDY 3.1 is now disable by default bug 1287132.
• Support for X-Content-Type-Options has been added (bug 471020).

Networking

• The ping attribute of <a> element is now abiding by the connect-src CSP 1.1 policy directive (bug 1100181).
• Support of the sandbox CSP directive has been added (bug 671389).

Segurança

Nenhuma mudança.

Changes for add-on and Mozilla developers

Interfaces

No change.

XUL

No change.

JavaScript code modules

No change.

XPCOM

No change.

Outroas

No change.

Veja também

• Site Compatibility for Firefox 50

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