The only browser to still have an issue with this should be MSIE, and that should be resolved with IE10 which will feature an HTML5 parser[0]: http://blogs.msdn.com/b/ie/archive/2011/07/06/html5-parsing-...

All other major browsers have already switched to an HTML5 parser

* Firefox since Firefox 4: http://hacks.mozilla.org/2010/05/firefox-4-the-html5-parser-...

* Webkit since ~early 2011: http://www.webkit.org/blog/1273/the-html5-parsing-algorithm/ I don't have the exact dates for stable versions of Chrome and Safari

* Opera since December 2011: http://www.opera.com/docs/changelogs/windows/1160/

[0] "html5 parser" is used as a shortcut for "parser implementing the HTML5 parsing algorithm"