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603310837mention the problem with UAs that don't support playbackRate reliably.2011-04-27 22:10
@@ -36915,20 +36915,24 @@ interface <dfn>TextTrackCue</dfn> {
   hardware resources in the device. For example, a device might only
   support three simultaneous videos. For this reason, it is a good
   practice to release resources held by <span title="media
   element">media elements</span> when they are done playing, either by
   being very careful about removing all references to the element and
   allowing it to be garbage collected, or, even better, by removing
   the element's <code title="attr-media-src">src</code> attribute and
   any <code>source</code> element descendants, and invoking the
   element's <code title="dom-media-load">load()</code> method.</p>
 
+  <p>Similarly, when the playback rate is not exactly 1.0, hardware,
+  software, or format limitations can cause video frames to be dropped
+  and audio to be choppy or muted.</p>
+
 
   <div class="impl">
 
   <h5>Best practices for implementors of media elements</h5>
 
   <!--END dev-html--><p><i>This section is non-normative.</i></p><!--START dev-html-->
 
   <p>How accurately various aspects of the <span>media element</span>
   API are implemented is considered a quality-of-implementation issue.</p>
 

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