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diff --git a/testing/web-platform/tests/webvtt/interfaces.html b/testing/web-platform/tests/webvtt/interfaces.html
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index 000000000..8cc4bb948
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+++ b/testing/web-platform/tests/webvtt/interfaces.html
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+<!doctype html>
+<title>WebVTT IDL tests</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/WebIDLParser.js></script>
+<script src=/resources/idlharness.js></script>
+
+<h1>WebVTT IDL tests</h1>
+<div id=log></div>
+
+<script type=text/plain>
+enum AutoKeyword { "auto" };
+enum DirectionSetting { "" /* horizontal */, "rl", "lr" };
+enum AlignSetting { "start", "middle", "end", "left", "right" };
+[Constructor(double startTime, double endTime, DOMString text)]
+interface VTTCue : TextTrackCue {
+           attribute VTTRegion? region;
+           attribute DirectionSetting vertical;
+           attribute boolean snapToLines;
+           attribute (double or AutoKeyword) line;
+           attribute AlignSetting lineAlign;
+           attribute (double or AutoKeyword) position;
+           attribute AlignSetting positionAlign;
+           attribute double size;
+           attribute AlignSetting align;
+           attribute DOMString text;
+  DocumentFragment getCueAsHTML();
+};
+
+enum ScrollSetting { "" /* none */, "up" };
+[Constructor]
+interface VTTRegion {
+           attribute double width;
+           attribute long lines;
+           attribute double regionAnchorX;
+           attribute double regionAnchorY;
+           attribute double viewportAnchorX;
+           attribute double viewportAnchorY;
+           attribute ScrollSetting scroll;
+};
+</script>
+<script>
+"use strict";
+var idlArray;
+setup(function() {
+	idlArray = new IdlArray();
+	[].forEach.call(document.querySelectorAll("script[type=text\\/plain]"), function(node) {
+		if (node.className == "untested") {
+			idlArray.add_untested_idls(node.textContent);
+		} else {
+			idlArray.add_idls(node.textContent);
+		}
+	});
+}, {explicit_done:true});
+window.onload = function() {
+	idlArray.add_objects({
+		// WebVTT
+		VTTCue: ['new VTTCue(0, 1, "foo")'],
+		VTTRegion: ['new VTTRegion()']
+	});
+	idlArray.test();
+	done();
+};
+</script>