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<html>
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<style>
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div {
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color: red;
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}
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div::selection {
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background-color: lime;
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}
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</style>
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<div id="foo">Hello world</div>
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<script>
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document.write('<p>The number of matched rules is: ' +
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document.defaultView.getMatchedCSSRules(document.getElementById('foo'), '').length);
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</script>
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