This tool is an ongoing experiment in better HTML checking, and its behavior remains subject to change

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Checker Input


  1. Warning: Being lax about non-XML Content-Type: text/html


  2. Warning: text/* type without a charset parameter seen. Would have defaulted to US-ASCII had the lax option not been chosen.


  3. Info: Using the preset for XHTML with SVG 1.1, MathML 3.0, RDFa 1.1, and ITS 2.0 support based on the root namespace.

The document validates according to the specified schema(s) and to additional constraints checked by the validator.


  1. <!DOCTYPE html><html lang="nn" xmlns="" xml:lang="nn" dir="ltr"><head><title>T</title><meta charset="UTF-8"/></head><body><h1>ó</h1></body></html>

Total execution time 2 milliseconds.

About this checkerReport an issueVersion: 15.7.30