[whatwg] rp is a styling tag and has no semantic function

[Nikita Popov]

In the spec the use of the rp-tag is shown like this:

<ruby>
 漢 <rp>(</rp><rt>かん</rt><rp>)</rp>
 字 <rp>(</rp><rt>じ</rt><rp>)</rp>
</ruby>

What semantic function has the rp-tag? No. It is only styling for 
browsers not supporting ruby-text.
So I think this element musn't be in the HTML5 spec. You can add the 
brackets before and after the ruby text using CSS pseudoclasses (:after, 
:before).