span, p, and html

<!doctype html>
<html lang="en">

Given the html page above, the first <div> “inside” <p> is actually valid because </p> is optional. The end result is <p></p><div></div></p> with the last </p> being invalid because there’s no matching <p>.

On the other hand, <span> requires matching </span> so even though <div> can’t be put inside <span>, browsers still consider it to be inside the <span>, making it seem correct when viewed from developer tools.

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