Support for ruby tag which is essential for
Furigana in XHTML. Although the tag was defined in
w3c standards back in 1999, it's kind of shocking that even some mainstream free browsers
1) doesn't support this tag. In fact, only
WebKit based browsers
2) seem to be doing their job right seems to be doing it's job right. Respective
Mozilla/Gecko bugzilla entry has been sitting idle since 2000! Albeit all Gecko programs suffer from this, there are add-ons that remedy the situation for Firefox.
XHTML Ruby Support is a CPU monster, so I'd suggest using
HTML Ruby (latter doesn't support selecting the ruby text though, which means you cannot copy furigana text with that one.)