For html 5 `/` is [syntactic sugar](http://dev.w3.org/html5/spec-author-view/syntax.html#syntax-start-tag),  for `meta` which is is a [void element](http://www.w3.org/html/wg/drafts/html/master/single-page.html#void-elements) I just think then we should keep the same thig everywhere either never `/` or always `/`. Keeping `/` would increase compatibility with xhtml (I think). but the issue can be [pretty subtle](http://stackoverflow.com/questions/97522/what-are-all-the-valid-self-closing-elements-in-xhtml-as-implemented-by-the-maj)