It looks like that you cannot just simply convert HTML to HTML5 with some kind of dedicated utility. You will need to manually update your HTML to HTML5 specifications so it is HTML5 valid. You can find more information at HTML5 migration website.
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Conversion of html file format to html5 file format beta
Search for html to html5 converter or software able to handle these file types.
Convert HyperText Markup Language web page to HTML5 Hypertext Markup Language revision 5 source.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: html file extension details, html5 file extension details
HTML
Files with html file extension are web pages and documents written in the most common scripting language for internet - the Hypertext Markup Language.
HTML5
Files with html5 extension can be sometimes found as html5 source codes for web pages. Usually the extension is just HTML.
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