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chromium/third_party/blink/web_tests/external/wpt/shadow-dom/untriaged/elements-and-dom-objects/shadowroot-object/shadowroot-attributes/test-011.html 

<!DOCTYPE html>
<html>
<head>
<title>Shadow DOM Test: A_10_01_01_05_01</title>
<link rel="author" title="Sergey G. Grekhov" href="mailto:[email protected]">
<link rel="help" href="http://www.w3.org/TR/2013/WD-shadow-dom-20130514/#shadow-root-attributes">
<meta name="assert" content="ShadowRoot Object: styleSheets of type StyleSheetList, readonly">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../../../../html/resources/common.js"></script>
<script src="../../../../resources/shadow-dom-utils.js"></script>
</head>
<body>
<div id="log"></div>
<script>
test(unit(function (ctx) {

    var d = newRenderedHTMLDocument(ctx);

    var host = d.createElement('div');
    d.body.appendChild(host);
    var s = host.attachShadow({mode: 'open'});

    assert_true(s.styleSheets != null, 'ShadowRoot styleSheets attribute shouldn\'t be null');
    assert_equals(s.styleSheets.length, 0, 'attribute must return the shadow root style sheets only');

}), 'A_10_01_01_05_01_T01');


test(unit(function (ctx) {

    var d = newRenderedHTMLDocument(ctx);

    var host = d.createElement('div');
    d.body.appendChild(host);
    var s = host.attachShadow({mode: 'open'});

    var style = d.createElement('style');
    s.appendChild(style);

    assert_true(s.styleSheets != null, 'ShadowRoot styleSheets attribute shouldn\'t be null');
    assert_equals(s.styleSheets.length, 1, 'attribute must return the shadow root style sheets');

}), 'A_10_01_01_05_01_T02');
</script>
</body>
</html>