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Clarify the purpose of a section or explain complex logic.
Quickly "comment out" a block of HTML to hide it without deleting it.
Add "TODO" notes or reminders for future work directly in the code.
<!-- and ends with -->. Everything in between is ignored by the browser.<!-- This is a single-line comment --> <p>This paragraph is visible.</p>
<!-- This is a multi-line comment. It can span across several lines. Useful for longer explanations. --> <p>Another visible paragraph.</p>
<!-- <p>This paragraph is commented out and will not be displayed.</p> --> <p>But this one will!</p>
Practical examples of single-line, multi-line, and commenting out code
<div class="container">
<h1>HTML Comments Demo</h1>
<!-- This is a single-line comment -->
<p class="intro">This paragraph appears in the output.</p>
<!--
This is a multi-line comment.
It spans multiple lines.
Perfect for longer explanations!
-->
<section class="features">
<h2>Active Features</h2>
<ul>
<li>✅ Feature One - Active</li>
<!-- <li>🚧 Feature Two - Under Development</li> -->
<li>✅ Feature Three - Active</li>
</ul>
</section>
<!--
TODO: Add a newsletter signup form here
PRIORITY: High
ASSIGNED: Frontend Team
-->
<div class="info-box">
<h3>Did you know?</h3>
<p>Comments are completely invisible in the browser but visible in source code!</p>
</div>
<!-- This entire section is commented out
<section class="disabled">
<h2>Temporarily Hidden Section</h2>
<p>This won't appear until we uncomment it.</p>
</section>
-->
<!-- NOTE: The section above demonstrates commenting out entire blocks -->
<footer>
<!-- Copyright 2025 -->
<p>Made with ❤️ and HTML</p>
</footer>
</div>Loading preview...
<!--[if IE]> <p>Legacy Internet Explorer notice.</p> <![endif]-->
Deprecated: kept for historical context—do not use in modern code.
<!-- PROD_ONLY: remove debug panel --> <!-- EXPERIMENT_A: variant test -->
Used by static site generators or custom transform scripts to strip / inject content.
<!-- HEADER START --> <nav>...</nav> <!-- HEADER END -->
Clarify large template segments—especially helpful in server-rendered monoliths.
<!-- ... <!-- ... --> ... -->.TODO:, NOTE:, FIXME:.