This allows to format Japanese furigana (aka ruby) notation.
Present in XHTML 1.1, HTML 5 and later. Absent in XHTML 1.0, HTML 4 and earlier.
See https://www.w3.org/TR/ruby/
Meta.allow_tag_with_these_attributes(:strong, [])
Meta.allow_tag_with_these_attributes(:sub, [])
Meta.allow_tag_with_these_attributes(:sup, [])
Meta.allow_tag_with_these_attributes(:strong, [])
Meta.allow_tag_with_these_attributes(:sub, [])
Meta.allow_tag_with_these_attributes(:sup, [])
+ Meta.allow_tag_with_these_attributes(:ruby, [])
+ Meta.allow_tag_with_these_attributes(:rb, [])
+ Meta.allow_tag_with_these_attributes(:rp, [])
+ Meta.allow_tag_with_these_attributes(:rt, [])
+ Meta.allow_tag_with_these_attributes(:rtc, [])
Meta.allow_tag_with_these_attributes(:u, [])
Meta.allow_tag_with_these_attributes(:ul, [])
Meta.allow_tag_with_these_attributes(:u, [])
Meta.allow_tag_with_these_attributes(:ul, [])