Revision 978207 of Firefox 25 for developers

<h2 id="Changes_for_Web_developers">Changes for Web developers</h2>

<h3 id="New_in_Firefox_DevTools">New in Firefox DevTools</h3>

<ul>
 <li>The inspector now features autocompletion for CSS names and values.</li>
 <li>The debugger now lets you "black box" script files, to prevent breakpoints from stopping in library code you're not interested in debugging.</li>
 <li>The Profiler now has the ability to save and import profiling results. "Show Gecko Platform Data" is now an option in the Firefox developer tools options.</li>
 <li>The Network panel has a right-click context menu, with copy and resend URL commands.</li>
 <li>Numerous under-the-hood changes may make some rewriting necessary for addons that modify the DevTools.</li>
</ul>

<h3 id="CSS">CSS</h3>

<ul>
 <li>The support for the keyword <code>local</code> as a value of the {{cssxref("background-attachment")}} CSS property has been added ({{bug("483446")}}).</li>
 <li>Support of a non-standard Mozilla-only media query to determine the operating system version has been added: <code><a href="/en-US/docs/Web/Guide/CSS/Media_queries#-moz-os-version" title="/en-US/docs/Web/Guide/CSS/Media_queries#-moz-os-version">-moz-os-version</a></code> ({{bug("810399")}}). The property is currently only implemented on Windows.</li>
 <li>The {{cssxref("-moz-osx-font-smoothing")}} CSS property has been added ({{bug("857142")}}).</li>
 <li>Our experimental support for {{cssxref("filter")}} now supports the <code>hue-rotate()</code> functional notation ({{bug(897392)}}). It is still preffed off by default.</li>
 <li>
  <p><code>page-break-inside</code><code>: avoid</code> is now working with the height of a block ({{bug(883676)}}).</p>
 </li>
</ul>

<h3 id="HTML">HTML</h3>

<ul>
 <li>The {{htmlattrxref("srcdoc", "iframe")}} attribute of {{HTMLElement("iframe")}}, allowing the inline specification of the content of an {{HTMLElement("iframe")}}, is now supported ({{bug("802895")}}).</li>
 <li>When used with a <code>"image/jpeg"</code> type, the method <code>HTMLCanvasElement.toBlob</code> now accepts a third attribute defining the quality of the image ({{bug("891884")}}).</li>
</ul>

<h3 id="JavaScript">JavaScript</h3>

<p><a href="/en-US/docs/Web/JavaScript/ECMAScript_6_support_in_Mozilla" title="/en-US/docs/Web/JavaScript/ECMAScript_6_support_in_Mozilla">EcmaScript 6</a> (Harmony) implementation continues!</p>

<ul>
 <li>The method {{jsxref("Array.of()")}} is now implemented on <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array" title="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array">Array</a></code> ({{bug("866849")}}).</li>
 <li>Support for the methods {{jsxref("Array.prototype.find()")}} and {{jsxref("Array.prototype.findIndex()")}} has been added ({{bug("885553")}}).</li>
 <li>The methods {{jsxref("Global_Objects/Number/parseInt", "Number.parseInt()")}} and {{jsxref("Global_Objects/Number/parseFloat", "Number.parseFloat()")}} have been implemented ({{bug("886949")}})</li>
 <li>The methods {{jsxref("Map.prototype.forEach()")}} and {{jsxref("Set.prototype.forEach()")}} are now implemented ({{bug("866847")}}).</li>
 <li>New mathematical methods have been implemented on <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math" title="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math"><code>Math</code></a>: <code>Math.log10()</code>, <code>Math.log2()</code>, <code>Math.log1p()</code>, <code>Math.expm1()</code>, <code>Math.cosh()</code>, <code>Math.sinh()</code>, <code>Math.tanh()</code>, <code>Math.acosh()</code>, <code>Math.asinh()</code>, <code>Math.atanh()</code>, <code>Math.trunc()</code>, <code>Math.sign()</code> and <code>Math.cbrt()</code> ({{bug("717379")}}).</li>
 <li>Support for binary and octal integer literals has been added: <code>0b10101010</code>, <code>0B1010</code>, <code>0o777</code>, <code>0O237</code> are now valid ({{bug("894026")}}).</li>
 <li>The machine epsilon constant, that is <font class="quoteHeader">the smallest representible number that added to 1 will not be 1,</font> is now available as {{jsxref("Global_Objects/Number/EPSILON", "Number.EPSILON")}} ({{bug("885798")}}).</li>
 <li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray">Typed arrays</a> have been updated to <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray#Indexed_property_access">no longer search in the prototype chain for indexed properties</a> ({{bug("829896")}}).</li>
</ul>

<h3 id="InterfacesAPIsDOM">Interfaces/APIs/DOM</h3>

<ul>
 <li>The <a href="/en-US/docs/Web_Audio_API" title="/en-US/docs/Web_Audio_API">Web Audio API</a> is now supported. An incomplete implementation was previously available behind a preference ({{bug("779297")}}).</li>
 <li>Some IME related keys on Windows are supported by <code>KeyboardEvent.key</code> ({{bug("865565")}}), see <a href="/en-US/docs/Web/API/KeyboardEvent#keyname_table_win" title="/en-US/docs/Web/API/KeyboardEvent#keyname_table_win">the key name table</a> for the detail.</li>
 <li>Firefox for Metro now dispatches key events in the same way as the desktop version ({{bug("843236")}}).</li>
 <li><code>keypress</code> event is no longer dispatched if <code>preventDefault()</code> of preceding <code>keydown</code> event is called ({{bug("501496")}}), see <a href="/en-US/docs/Web/Reference/Events/keydown#preventDefault()_of_keydown_event" title="/en-US/docs/Web/Reference/Events/keydown#preventDefault()_of_keydown_event">the document of <code>keydown</code> event</a> for the detail.</li>
 <li>Renamed the <code>Future</code> interface to <code>Promise</code> ({{bug("884279")}}).</li>
 <li>The <code>srcDoc</code> property on the {{domxref("HTMLIFrameElement")}} interface, allowing the inline specification of the content of an {{HTMLElement("iframe")}}, is now supported ({{bug("802895")}}).</li>
 <li>The <code>createTBody()</code> method on the {{domxref("HTMLTableElement")}} interface, allowing to get its {{HTMLElement("tbody")}}, is now supported ({{bug("813034")}}).</li>
 <li>The {{domxref("Range.collapse()")}} method <code>toStart</code> parameter is now optional and default to <code>false</code>, like defined in the spec ({{bug("891340")}}).</li>
 <li>Support of {{domxref("ParentNode")}} interface on {{domxref("Document")}} and {{domxref("DocumentFragment")}} has been added ({{bug("895974")}}).</li>
 <li>The <code>previousElementSibling</code> and <code>nextElementSibling</code> have been moved to {{domxref("ChildNode")}} allowing them to be called not only on a {{domxref("Element")}} object but also on a {{domxref("CharacterData")}} or {{domxref("DocumentType")}} object ({{bug("895974")}}).</li>
 <li>The <code>navigator.geolocation</code> property has been updated to match the spec. It never returns <code>null</code>. When the preference <code>geo.enabled</code> is set to <code>false</code>, it now returns <code>undefined</code> ({{bug("884921")}}).</li>
 <li>The <code>videoPlaybackQuality</code> attribute on the {{ domxref("HTMLVideoElement") }} interface has been changed to the <code>getVideoPlaybackQuality</code> method. ({{bug(889205)}})</li>
 <li>The non-standard <code>GlobalObjectConstructor</code> interface has been removed ({{bug(898136)}}). This interface was used to add arguments to the constructors of APIs that Firefox <a href="/en-US/Add-ons">add-ons</a> were exposing on the global object. This capability has been removed; note that at this time there's no replacement for this functionality.</li>
</ul>

<h3 id="MathML">MathML</h3>

<p><em>No change.</em></p>

<h3 id="SVG">SVG</h3>

<p><em>No change.</em></p>

<h2 id="See_also">See also</h2>

<ul><!-- <li><a href="https://www.mozilla.org/en-US/firefox/25.0a2/auroranotes/">Firefox 25 Aurora Notes</a></li> -->
 <li><a href="https://www.fxsitecompat.com/en-US/versions/25/">Site Compatibility for Firefox 25</a></li>
</ul>

<h3 id="Older_versions">Older versions</h3>

<p>{{Firefox_for_developers('24')}}</p>