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chromium/third_party/blink/web_tests/fast/dom/shadow/shadow-root-innerHTML.html 

<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/js-test.js"></script>
</head>
<body>
<div id="console">
</div>
<script>
description("This tests the innerHTML property of a shadow root.");

if (!window.internals)
    debug('This test runs on DRT only');

host = document.createElement("div");
document.body.appendChild(host);
root = host.attachShadow({mode: 'open'});

var div1 = document.createElement("div");
div1.setAttribute("id", "div1");
root.appendChild(div1);

var div2 = document.createElement("div");
div2.setAttribute("id", "div2");
root.appendChild(div2);

shouldBeFalse("'innerHTML' in internals.shadowRoot");
shouldBeDefined("root.innerHTML");
shouldBe("root.innerHTML", "'<div id=\"div1\"></div><div id=\"div2\"></div>'");

root.innerHTML = "Hello";
shouldBe("root.innerHTML", "'Hello'");

root.innerHTML = "<p id=\"p3\">HelloWorld</p>";

shouldBe("root.innerHTML", "'<p id=\"p3\">HelloWorld</p>'");
shouldBe("root.firstChild.nodeName", "'P'");
shouldBe("root.querySelectorAll('div')", "[]");
shouldBe("root.getElementById('p3').innerHTML", "'HelloWorld'");

var successfullyParsed = true;
</script>
</body>
</html>