The validator checks against HTML5 standards. It catches common issues like unclosed tags, invalid nesting, missing required attributes, and deprecated elements.
What's the difference between HTML and XML validation?
HTML is more forgiving than XML. Self-closing tags like <br> are valid in HTML but require <br/> in XML. Check our XML Validator for stricter validation.
Does this check for accessibility issues?
The validator focuses on HTML syntax and structure. For accessibility (WCAG) validation, use specialized tools like axe or WAVE alongside this validator.
Does my HTML get sent anywhere to be validated?
No. HTML validation and formatting run client-side in your browser, so your markup, inline scripts, and any embedded data stay on your device. Nothing is uploaded to a server, which is useful when working on unreleased pages or internal templates.
