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<!DOCTYPE html> <title>Example</title> <style> div { background: gold; width: 150px; height: 150px; padding: 10px; border: 20px solid black; margin: 10px; float: left; } .content-box { box-sizing: content-box; } .border-box { box-sizing: border-box; } </style> <div class="content-box"> content-box </div> <div class="border-box"> border-box </div>
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