Auto-Furigana in the Browser — Lazy-Loading kuromoji.js's 4 MB Dictionary from a CDN to Annotate Japanese Kanji With Their Readings

Furigana are the small hiragana annotations that sit above kanji to show how they should be read. Schoolbooks, kid manga, and language-learning material all rely on them. The problem: typing them by hand is slow, and most online services that auto-annotate require sending your text to a server you d