Using experimental feature: HTML5 Conformance Checker
The validator checked your document with an experimental feature:
HTML5 Conformance Checker. This feature has been
made available for your convenience, but be aware that it may be unreliable, or not perfectly
up to date with the latest development of some cutting-edge technologies. If you find any issues
with this feature, please report them. Thank you.
The W3C Internationalization Checker found no issues to report
The Internationalization Checker also summarizes key internationalization information about a page, such as character encoding, language declarations, directionality, etc. Recheck that document on the i18n-checker website to see that information for this page.