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A command-line tool for testing HTML5 validity. More information:

  • Validate a specific file:

html5validator {{path/to/file}}

  • Validate all HTML files in a specific directory:

html5validator --root {{path/to/directory}}

  • Show warnings as well as errors:

html5validator --show-warnings {{path/to/file}}

  • Match multiple files using a glob pattern:

html5validator --root {{path/to/directory}} --match "{{*.html *.php}}"

  • Ignore specific directory names:

html5validator --root {{path/to/directory}} --blacklist "{{node_modules vendor}}"

  • Output the results in a specific format:

html5validator --format {{gnu|xml|json|text}} {{path/to/file}}

  • Output the log at a specific verbosity level:

html5validator --root {{path/to/directory}} --log {{debug|info|warning}}