Apparently, you can still write polyglot documents that are both valid XHTML and HTML5.[1] But this requires closing void tags with <tag />. [1] http://blog.wh

Apparently, you can still write polyglot documents that are both valid XHTML and HTML5.[1] But this requires closing void tags with <tag />. [1] http://blog.whatwg.org/xhtml5-in-a-nutshell http://blog.whatwg.org/xhtml5-in-a-nutshell