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<html>
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<body>
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<p style="color: green">This text should be green if viewport is wider than 30em.</p>
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<div style="width: 30em; background-color: lightblue;">div of length 30 em</div>
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<div style="width: 800px; background-color: lightblue;">div of length 800px</div>
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</body>
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</html>
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