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diff --git a/dom/media/test/test_VideoPlaybackQuality_disabled.html b/dom/media/test/test_VideoPlaybackQuality_disabled.html
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+++ b/dom/media/test/test_VideoPlaybackQuality_disabled.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test basic functionality of VideoPlaybackQuality</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+function test() {
+ var video = document.createElement("video");
+ ok(!video.getVideoPlaybackQuality, "getVideoPlaybackQuality should be hidden behind a pref");
+ var accessThrows = false;
+ try {
+ video.getVideoPlaybackQuality();
+ } catch (e) {
+ accessThrows = true;
+ }
+ ok(accessThrows, "getVideoPlaybackQuality should be hidden behind a pref");
+ SimpleTest.finish();
+}
+
+addLoadEvent(function() {
+ SpecialPowers.pushPrefEnv({"set":
+ [
+ ["media.mediasource.enabled", false],
+ ]
+ }, test);
+});
+</script>
+</pre>
+</body>
+</html>