​x
 
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<!DOCTYPE html>
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<title>Example</title>
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<style>
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    #unique {
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        font-size: 2em;
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        color: yellowgreen;
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    }
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</style>
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​
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<blockquote>Price is what you pay. <span id="unique">Value</span> is what you get.</blockquote>
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​
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<p>Note that an ID can only be applied to one element on the page. To apply styles to more than one element, uses classes.</p>