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html5validator — Validate HTML5. More information: <https://github.com/svenkreiss/html5validator>.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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httpscommandhtml5validatorclihtml5informationvalidatemore

Problem

How to use the html5validator command: Validate HTML5. More information: <https://github.com/svenkreiss/html5validator>.

html5validator — Validate HTML5. More information: <https://github.com/svenkreiss/html5validator>.

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}}

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}}"

tldr-pages: common/html5validator

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