Revision 974259 of PerformanceMeasure

<div>{{APIRef("User Timing API")}}</div>

<p><code><strong>PerformanceMeasure</strong></code> is an <em>abstract</em> interface for {{domxref("PerformanceEntry","performance entries")}} with an {{domxref("PerformanceEntry.entryType","entry type")}} of "<code>measure</code>". Entries of this type are created by calling {{domxref("Performance.measure","performance.measure()")}} to add a <em>named</em> {{domxref("DOMHighResTimeStamp","timestamp")}} (the <em>measure</em>) between two <em>marks</em> to the browser's <em>performance timeline</em>.</p>

<p class="note">The <code>PerformanceMeasure</code> interface has no properties, no methods nor any constructors. However, it qualifies and constrains the following {{domxref("PerformanceEntry")}} properties for "<code>measure</code>" type {{domxref("PerformanceEntry","performance entries")}}: {{domxref("PerformanceEntry.name","name")}}, {{domxref("PerformanceEntry.entryType","entryType")}}, {{domxref("PerformanceEntry.startTime","startTime")}} and {{domxref("PerformanceEntry.duration","duration")}}.</p>

<h2 id="Properties">Properties</h2>

<p>This interface has no properties but it extends the following {{domxref("PerformanceEntry")}} properties by qualifying/constrainting the properties as follows:</p>

<dl>
 <dt>{{domxref("PerformanceEntry.entryType","entryType")}}</dt>
 <dd>Set to "<code>measure</code>".</dd>
 <dt>{{domxref("PerformanceEntry.name","name")}}</dt>
 <dd>Set to the <code>name</code> given to the measure when it was created via a call to {{domxref("Performance.measure()","performance.measure()")}}.</dd>
 <dt>{{domxref("PerformanceEntry.startTime","startTime")}}</dt>
 <dd>Set to the {{domxref("DOMHighResTimeStamp","timestamp")}} when {{domxref("Performance.measure()","performance.measure()")}} was called.</dd>
 <dt>{{domxref("PerformanceEntry.duration","duration")}}</dt>
 <dd>Set to a {{domxref("DOMHighResTimeStamp")}} that is the duration of the measure (typically, the measure's end mark timestamp minus its start mark timestamp).</dd>
</dl>

<h2 id="Methods">Methods</h2>

<p>This interface has no methods.</p>

<h2 id="Example">Example</h2>

<p>See the example in <a href="/Web/API/User_Timing_API/Using_the_User_Timing_API">Using the User Timing API</a>.</p>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('User Timing Level 2', '#dom-performance-measure', 'PerformanceMeasure')}}</td>
   <td>{{Spec2('User Timing Level 2')}}</td>
   <td>&nbsp;</td>
  </tr>
  <tr>
   <td>{{SpecName('User Timing', '#performancemeasure', 'PerformanceMeasure')}}</td>
   <td>{{Spec2('User Timing')}}</td>
   <td>Basic definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support.</td>
   <td>43</td>
   <td>41</td>
   <td>10</td>
   <td>33</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Firefox OS</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support.</td>
   <td>46</td>
   <td>42</td>
   <td>42</td>
   <td>10</td>
   <td>33</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

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

<ul>
 <li><a href="/Web/API/User_Timing_API">User Timing (Overview)</a></li>
 <li><a href="/Web/API/User_Timing_API/Using_the_User_Timing_API">Using the User Timing API</a></li>
</ul>