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diff --git a/dom/media/webvtt/test/crashtests/1304948.html b/dom/media/webvtt/test/crashtests/1304948.html
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+<html class="reftest-wait">
+<head>
+ <title> Bug 1304948 : Crash if a texttrack remove a cue not belongs to it. </title>
+</head>
+<meta charset="utf-8">
+<script type="text/javascript">
+
+window.onload = function() {
+ var a = document.createElementNS('http://www.w3.org/1999/xhtml', 'video');
+ a.src = "";
+ document.body.appendChild(a);
+ var b = a.addTextTrack('chapters', "AAAAAAAAAAAAAAAA", "de");
+ var c = new VTTCue(0.6, 0.3, "AA");
+ b.addCue(c);
+ var d = document.createElementNS('http://www.w3.org/1999/xhtml', 'video');
+ var e = d.addTextTrack('chapters', "AAAA", "en-US");
+ a.currentTime = 2;
+ a.play();
+ try {
+ // This will queue a TimeMarchesOn task on mainthread, so use
+ // timer to wait the TimeMarchesOn crash.
+ e.removeCue(c);
+ } catch (e) {
+ if (e.name == "NotFoundError") {
+ setTimeout(function() {
+ document.documentElement.removeAttribute("class");}, 0);
+ }
+ }
+};
+
+</script>
+</body>
+</html>