| Index: LayoutTests/media/track/media-element-move-to-new-document-assert.html
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| diff --git a/LayoutTests/media/track/media-element-move-to-new-document-assert.html b/LayoutTests/media/track/media-element-move-to-new-document-assert.html
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| new file mode 100644
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| index 0000000000000000000000000000000000000000..ccaa218c43255b7d966b5148228fdc497e6b1795
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| --- /dev/null
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| +++ b/LayoutTests/media/track/media-element-move-to-new-document-assert.html
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| @@ -0,0 +1,22 @@
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| +<!DOCTYPE html>
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| +<p>Test for failing EventDispatchForbiddenScope assert when moving a
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| +video with text track between documents.</p>
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| +<video></video>
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| +<iframe></iframe>
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| +<script>
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| +if (window.testRunner)
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| +  testRunner.dumpAsText();
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| +
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| +var video = document.querySelector("video");
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| +var track = document.createElement("track");
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| +
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| +// Note: The order of setting the text track mode and appending the
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| +// track element is important, in terms of implementation and spec:
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| +// https://www.w3.org/Bugs/Public/show_bug.cgi?id=28973
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| +track.track.mode = "showing";
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| +video.appendChild(track);
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| +
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| +// Move the video element to another document.
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| +var iframe = document.querySelector("iframe");
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| +iframe.contentDocument.body.appendChild(video);
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| +</script>
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| 
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