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chromium/third_party/blink/web_tests/fast/dom/document-importNode-arguments.html 

<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<p>This page tests calling document.importNode.</p>
<div id='console'></div>
<script>
var imported;

if (window.testRunner)
    testRunner.dumpAsText();

var d = document.createElement("div");
d.innerHTML = "<span>hello </span><span>world</span>";

imported = document.importNode(d);
shouldBe('imported.childNodes.length','0');
shouldBeTrue("imported.textContent == ''");

imported = document.importNode(d, true);
shouldBe('imported.childNodes.length','2');
shouldBeTrue("imported.textContent == 'hello world'");

imported = document.importNode(d, false);
shouldBe('imported.childNodes.length','0');
shouldBeTrue("imported.textContent == ''");

</script>
</body>
</html>