The use of explicit tonic accent over-strike is becoming more common in Cyrillic to disambiguate words and as a teaching aid.
Curl currently has {underline } and {line-through}.
A text format for a configurable {double-strike } or {over-strike } would permit placement of a major or minor accent over a character in a visual TextPart.
If configurable, the feature could be toggled for a given TextDisplay, page or reading level or exercise.
For phonetic transliterations, underline remains as common as bold emphasis (in Russian, the tonic accent is more significant than in English and alters vowel values before and after.)
For English language instruction, the classic example is: "Tomorrow the band will record a new record." with the accent changing syllable from verb to noun.
