: How can I validate HTML offline? When I'm developing a website locally sometimes I want to check if the html is valid but I haven't been able to find a good tool. I want it partial as a

@Cugini213

In Debian/Ubuntu you can do:

sudo apt-get install w3c-markup-validator


This will get you the web interface.

If you want to validate from the console, edit /usr/share/doc/w3c-markup-validator/examples/validate.pl and install libwebservice-validator-html-w3c-perl. Now you can run validate.pl with an URL to validate.

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@Looi9037786

To save time I use a Firefox Extension called HTML Validator. It adds validation to your view source window, tells you errors and warnings in a bottom pane. Also puts an icon in the bottom of your window showing you a quick reference for yes/no on validation. If no, then you just view source and it shows you exactly what your errors are.

Also validates accessibility.

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@Steve110

You can validate HTML and CSS locally (and do a lot of other useful things) with the Web Developer Toolbar add-on for Firefox. It's also available for Google Chrome.

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@Rivera981

Have you checked out HTML Tidy?

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@Hamaas447

You can download the source and/or packages direct from w3[1].

[1] validator.w3.org/source/

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