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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:
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.
HTML Tidy, developed by Dave Raggett of W3C, can validate & automatically fix errors. It can work from the command-line
Total Validator seems to do what you're looking for
The HTML5 validator source code is available through SVN, has dependencies on Java.
You can now use the new Linux command line tool htmlval for checking HTML and CSS.
Note: I'm the developer.
Testing this HTML (in file example.html):
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
</head>
<body>
<badtag>
<span>span has no end tag
</body>
</html>
With this command (-l for list format, -S for no SEO messages):
htmlval -lS example.html
Produces this error list:
=================================
=== File 1 of 1: example.html ===
=================================
Error (line 6, col 11): This document has a <title> element but it does not contain a title when it must. Each page on a site should have its own unique (never duplicated) and well-written title.
Error (line 9, col 2): The <badtag> element is not valid. Is it misspelled?
Error (line 10, col 2): The <span> element must have an end tag (</span>) but the end tag was not found, is misplaced, misspelled, or was not seen due to other errors.
Error (line 11, col 2): The end tag for <span> (started in line 10, column 2) should appear before this </body> end tag or this end tag should be deleted or moved. This is a nesting error.
Comment: "Errors and warnings only" mode enabled. Showing only error and warning messages (with some exceptions).
