Revision 972787 of PerformanceMark

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

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

<p class="note">The <code>PerformanceMark</code> interface has no properties, no methods nor any constructors. It qualifies and constrains the following {{domxref("PerformanceEntry")}} properties for "<code>mark</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. However, it qualifies and constrains the following {{domxref("PerformanceEntry")}} properties for "<code>mark</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="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', '#performancemark', 'PerformanceMark')}}</td>
   <td>{{Spec2('User Timing Level 2')}}</td>
   <td>&nbsp;</td>
  </tr>
  <tr>
   <td>{{SpecName('User Timing', '#performancemark', 'PerformanceMark')}}</td>
   <td>{{Spec2('User Timing')}}</td>
   <td>Basic definition.</td>
  </tr>
 </tbody>
</table>

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

<p>This interface is not directly implemented. For compatibility data of the {{domxref("PerformanceEntry")}} properties this interface clarifies and constrains, see each property's reference page ({{domxref("PerformanceEntry.name","name")}}, {{domxref("PerformanceEntry.entryType","entryType")}}, {{domxref("PerformanceEntry.startTime","startTime")}} and {{domxref("PerformanceEntry.duration","duration")}}).</p>

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

<ul>
 <li><a href="/Web/API/User_Timing">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>