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<!DOCTYPE html>
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<style>
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div { color: red; }
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div::first-line { color: green }
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</style>
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<div id="x"><span id="y">green</span></div>
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<script>
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x.offsetWidth;
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var span = document.createElement('span');
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span.textContent = 'This should be ';
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x.insertBefore(span, y);
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</script>
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