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I want to check if an HTML5 document follows the polyglot markup profile as defined by http://www.w3.org/TR/html-polyglot/. AFAIK first validating as HTML and then as XML doesn’t suffice for this.

Input of the HTML5 document as URL, file upload and/or text input.

It can be anything (a Web app, a library, a desktop client for any OS, …), as long as it is FLOSS.

What I tried/know

  • http://validator.w3.org/ (FLOSS) doesn’t offer an option for this.

  • https://validator.nu/ (FLOSS) doesn’t offer an option for this (although it seems to have had it some time ago)

  • According to its website, Total Validator supports it ("3rd August 2014 - Total Validator v8.5.0 released: Polyglot Markup updated to 17 July 2014"). They offer a FLOSS Firefox extension, however, you seem to have to install their proprietary client in addition to make it work.

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