This userscript transliterates Japanese hiragana (平仮名) and katakana (平仮名)
text into Roman script (ローマ字) and renders both of the original text and
the transliteration using <ruby>
tag.
It requires Greasemonkey on Firefox and Tampermonkey on Chrome/Safari/Opera/Edge.
Written by Hong Minhee and distributed under GPLv3 or later.