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h1 { border: 3px solid red; }
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<p>These &lt;h1&gt;s should all be left-aligned:</p>

<h1 style="width: auto;">sample</h1>
<h1 style="width: 10em;">sample</h1>

<p>These &lt;p&gt;s should be (and are) left-aligned:</p>

<p style="width: auto;">sample</p>
<p style="width: 10em;">sample</p>

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