Moved to https://codeberg.org/derat/validate

AMP reads an AMP HTML document from r and validates it by running the amphtml-validator program, which must be present in $PATH.

AMPFiles runs amphtml-validator to validate multiple AMP HTML files at the supplied paths.

CSS reads an HTML or CSS document from r and validates its CSS content using https://jigsaw.w3.org/css-validator/.

HTML reads an HTML document from r and validates it using https://validator.w3.org/nu/.

LaunchBrowser launches a web browser with the supplied HTML page.

Error indicates an actual problem, e.g.

HTMLDoc is an HTML document.

Stylesheet is a standalone CSS stylesheet.

Warning indicates a minor issue, e.g.

Issue describes a problem reported by a validator.

FileType describes the type of file being validated.

Severity describes the severity of an issue.