nts to note here:</p>

<ol>
<li>This is feature detection, not browser detection. Instead of asking “which browser are you?” and trying to infer feature support from the answer, it is safer to simply ask “do you support this feature?”</li>
<li>There is no <code>else</code> statement.</li>
</ol>

</section>

<section aria-labelledby="aggressiveenhancement">

<h2 id="aggressiveenhancement">Aggressive enhancement</h2>

<p>Back when web designers were trying to exert print‐like control over web brow