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<!DOCTYPE html> <title>My Example</title> <style> #unique { background: gold; } div { width: 20vw; height: 20vh; float: left; margin: 1vw; padding: 1vw; border: solid; } p { clear: both; } </style> <div id="unique">ID</div> <div>No ID</div> <p>Note that only one element on the page can use a given ID. To style multiple elements, use a class.</p>
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