Add titles to spec. options at https://drafts.csswg.org/

Sebastian Zartner <[email protected]> Tue, 21 Jun 2016 13:57:41 +0200

Newsgroups	gmane.comp.web.css.general
Message-ID	<CAERejNZ8nOJqbOdLVAF0WExARGzZj9mH1mwxJN=vHQtQn0q9EQ@mail.gmail.com>

Each spec. line at https://drafts.csswg.org/ has several options
at the right side. Those options should show a tooltip when they are
hovered to clarify their meaning.

Sebastian