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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test for bug 1346623</title>
+ <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+ <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
+ <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body onload="startTest();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1346623">Mozilla Bug 1346623</a>
+<div id="display">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+var winUtils = window.windowUtils;
+
+function startTest() {
+ // load some styles at the agent level
+ var css = `
+ #ac-parent { color: green; }
+ #ac-child.abc { }
+ `;
+ var sheetURL = "data:text/css," + encodeURIComponent(css);
+ winUtils.loadSheetUsingURIString(sheetURL, winUtils.AGENT_SHEET);
+
+ // add canvas anonymous content
+ var bq = document.createElement("blockquote");
+ bq.id = "ac-parent";
+ bq.textContent = "This blockquote text should be green.";
+ var div = document.createElement("div");
+ div.id = "ac-child";
+ div.textContent = " This div text should be green.";
+ bq.appendChild(div);
+ var ac = document.insertAnonymousContent(bq);
+ document.body.offsetWidth;
+
+ is(ac.getComputedStylePropertyValue("ac-child", "color"), "rgb(0, 128, 0)",
+ "color before reframing");
+
+ // reframe the root
+ document.documentElement.style.display = "flex";
+ document.body.offsetWidth;
+
+ // restyle the div
+ ac.setAttributeForElement("ac-child", "class", "abc");
+ document.body.offsetWidth;
+
+ is(ac.getComputedStylePropertyValue("ac-child", "color"), "rgb(0, 128, 0)",
+ "color after reframing");
+ SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+</script>
+</pre>
+</body>
+</html>