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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:

http://webmasters.stackexchange.com/questions/1802/how-can-i-validate-html-offline

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4 Answers

up vote 3 down vote

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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I think this is it: dvcs.w3.org/hg/markup-validator – robertc Aug 19 '10 at 11:46
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validator.w3.org/source/#getting – Casey Aug 20 '10 at 23:55
The W3C Markup Validator is a Perl wrapper around a C validation engine. – Quentin Aug 21 '10 at 13:20
up vote 2 down vote

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? – Casey Aug 21 '10 at 1:51
up vote 1 down vote

Total Validator seems to do what you're looking for

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up vote 0 down vote

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 '10 at 14:07
@DisgruntledGoat It's the only one linked to from the WHATWG website: validator.whatwg.org – robertc Aug 19 '10 at 14:48

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