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diff --git a/accessible/tests/mochitest/treeupdate/test_canvas.html b/accessible/tests/mochitest/treeupdate/test_canvas.html
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+<!DOCTYPE html>
+<html>
+
+<head>
+ <title>Canvas subdom mutation</title>
+
+ <link rel="stylesheet" type="text/css"
+ href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+
+ <script type="application/javascript"
+ src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+ <script type="application/javascript"
+ src="../common.js"></script>
+ <script type="application/javascript"
+ src="../role.js"></script>
+ <script type="application/javascript"
+ src="../events.js"></script>
+
+ <script type="application/javascript">
+
+ ////////////////////////////////////////////////////////////////////////////
+ // Invokers
+
+ function addSubtree(aID)
+ {
+ this.node = getNode(aID);
+
+ this.eventSeq = [
+ new invokerChecker(EVENT_SHOW, this.node)
+ ];
+
+ this.invoke = function addSubtree_invoke()
+ {
+ // ensure we start with no subtree
+ testAccessibleTree("canvas", { CANVAS: [] });
+ getNode("dialog").style.display = "block";
+ }
+
+ this.finalCheck = function addSubtree_finalCheck() {
+ testAccessibleTree("dialog", { DIALOG: [] });
+ }
+
+ this.getID = function addSubtree_getID()
+ {
+ return "show canvas subdom";
+ }
+ }
+
+ ////////////////////////////////////////////////////////////////////////////
+ // Test
+
+ //gA11yEventDumpID = "eventdump"; // debug stuff
+ //gA11yEventDumpToConsole = true;
+
+ var gQueue = null;
+
+ function doTest()
+ {
+ gQueue = new eventQueue();
+
+ // make the subdom come alive!
+ gQueue.push(new addSubtree("dialog"));
+
+ gQueue.invoke(); // SimpleTest.finish() will be called in the end
+ }
+
+ SimpleTest.waitForExplicitFinish();
+ addA11yLoadEvent(doTest);
+ </script>
+</head>
+<body>
+
+ <a target="_blank"
+ title="Expose content in Canvas element"
+ href="https://bugzilla.mozilla.org/show_bug.cgi?id=495912">
+ Mozilla Bug 495912
+ </a>
+
+ <p id="display"></p>
+ <div id="content" style="display: none"></div>
+ <pre id="test">
+ </pre>
+
+ <canvas id="canvas">
+ <div id="dialog" role="dialog" style="display: none;">
+ </div>
+ </canvas>
+
+ <div id="eventdump"></div>
+</body>
+</html>