IgoIME, Web-based Japanese Input Method powered by Igo and works locally:

• Demo&info: https://shogo82148.github.io/IgoIME/

• Code: https://github.com/shogo82148/IgoIME

• 日本語が入力できないときはAjax IMEが便利: https://www.aruse.net/entry/2018/09/19/093831