[EPUB Reader] EPUB3 MediaOverlays
In English there are few mistakes in reading synthesized speech (TTS), but errors in other languages by all means will occur.
For that reason, for textbooks in Japanese language of elementary school lower grades, recording with real voice is necessary.
Currently it installs and plays playback software, but it is ideal if it can open directly by the browser and play it.
Please support EPUB3 MediaOverlays playback.