revision:
The <rp> tag can be used to provide parentheses around a ruby text, to be shown by browsers that do not support ruby annotations. Use <rp> together with <ruby> and <rt>: the "ruby" element consists of one or more characters that needs an explanation/pronunciation, and an "rt" element that gives that information, and an optional "rp" element that defines what to show for browsers that do not support ruby annotations.
<rp> . . . </rp>
<ruby style="margin-left: 4vw;"> 漢 </ruby>
<ruby style="margin-left: 4vw;"> 漢 <rp>(</rp><rt>Kan</rt><rp>)</rp> 字 <rp>(</rp><rt>ji</rt><rp>)</rp> </ruby>