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What programs can I use to validate HTML/XML markup?

Basically, I want a local, command-line based, version of W3C HTML validation service (like lint) that I can use for detecting errors.

Update

I would also accept a solution that uses the W3C web service from the command line.

Related Questions:

How can I validate HTML offline?

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The W3 validator is open source (written in Python I believe) so you can download and run it locally. I can't for the life of me find the download link on w3.org though.

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HTML Tidy, developed by Dave Raggett of W3C, can validate & automatically fix errors. It can work from the command-line

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  • I like tidy, is it as comprehensive as the W3C tool?
    – cmcginty
    Aug 21, 2010 at 1:51
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Total Validator seems to do what you're looking for

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The HTML5 validator source code is available through SVN, has dependencies on Java.

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  • What do you mean by "the"? That's not an official program, is it?
    – DisgruntledGoat
    Aug 19, 2010 at 14:07
  • @DisgruntledGoat It's the only one linked to from the WHATWG website: validator.whatwg.org
    – robertc
    Aug 19, 2010 at 14:48

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