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<html><head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>JS Bin</title></head><body> <div class="a"><h1>a</h1><code>margin-left: calc(0 + 5em);</code></div> <div class="b"><h1>b</h1><code>margin-left: calc(0px + 5em);</code></div> </body></html>
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