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Beautify or minify HTML and run a syntax check — catches unclosed and mismatched tags, stray closers, and duplicate ids. All in your browser.
<section class="card">
<h1>
Hello
</h1>
<p>
A
<a href="#">
link
</a>
and an image
<img src="x.png" alt="x">
<ul>
<li>
one
<li>
two
</ul>
</section>