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mohamedkhallouq
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 Path: blob/main/files/en-us/glossary/boolean/html/index.md
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---
title: Boolean attribute (HTML)
slug: Glossary/Boolean/HTML
page-type: glossary-definition
---

A boolean attribute in HTML is an attribute that can be either true or false.

It is worth noticing that a boolean attribute is true when it is present, and false when it is absent.

Here's an example of a HTML boolean attribute checked:

<!-- The following checkboxes will be checked on initial rendering -->
<input type="checkbox" checked />
<input type="checkbox" checked="" />
<input type="checkbox" checked="true" />
<input type="checkbox" checked="false" />
<input type="checkbox" checked="any value" />

<!-- The following checkbox will not be checked on initial rendering -->
<input type="checkbox" />

See also