​x
 
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<!DOCTYPE html>
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<title>Example</title>
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<style>
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  div {
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    padding: 20px;
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    border-bottom-width: 4px;
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    border-bottom-style: double;
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    border-bottom-color: orange;
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  }
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</style>
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​
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<div>
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  This 'div' has a bottom border.
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</div>