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Lints an HTML5 file using Google's style guide

Project description

HTML Linter

HTML Linter is an HTML5 linter that follows the style guide defined by Google.


Handling HTML5 files generated by lots of different of people is a difficult task, because the standard is evolving quite fast and also because browsers are quite open to accept any malformed/invalid/incomplete input.

That’s why we decided to have an automated tool to check our coding standard.

We start with the Google standard and we enhance it with some extra rules defined by the project html-minifier. You can read his detailed article.

The list of extra rules we added are:

  • Boolean attributes should not have an explicit value.

  • Do not use the name attribute in a tags.

  • Do not use the language attribute in script tags.

  • Do not use the charset attribute in script tags when there is no source.

  • Javascript:void(0) links are evil.

  • onclick=’javascript: …’ is not required. This will raise also a Concerns Separation error.

  • meta http-equiv: use only standard properties + X-UA-compatible

  • No extra white-spaces between attributes or before the opening or closing tag.

What is missing?

Check if the file has BOM.

The ability to validate the HTML using the tool HTML5 tidy and to integrate some or microdata validator.

However, we do not have any short terms plans to handle the latter, due to a couple of reasons:

  • Tidy can be easily integrated using the tool git-lint

  • Any other validator can also be integrated with git-lint

  • Adding any extra validator would pull many more dependencies and change the scope.


html_linter used the project template-remover to remove the PHP and Jinja markup from the files and this project works has some limitations.

One example that won’t work is the following:

<?php echo "?>" ?>

The reason it does not work is because when the method sees the first ‘?>’ (the one inside the string), it thinks it’s a closing tag.

Example use

Below are example of how is used:

$ filename.html


You can install, upgrade or uninstall html-linter with these commands:

$ pip install html-linter
$ pip install --upgrade html-linter
$ pip uninstall html-linter

Python Versions

Python 2.7, 3.3, 3.4, 3.5 and 3.6 are supported.


Help for this project is more than welcomed, so feel free to create an issue or to send a pull request via

Tests are run using nose, either with:

$ python -R nosetests
$ nosetests

Use the tool git-lint before any commit, so errors and style problems are caught early.

TODOS and Possible Features

  • Make the output less verbose.

  • Integrate with HTML5 tidy.

  • Integrate with a validator.



v0.4 (2017-03-30)

  • Support for a --printfilename option (#8)

  • Support for Python 3.6 (#12)

v0.3 (2016-01-24)

  • Support for multiple files (by @di)

v0.2 (2015-12-13)

  • Support for Python 3.5

v0.1 (2014-05-07)

  • Initial commit.

Project details

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