Ajax IME, Web-based Japanese Input Method, can adapt to any website (but by default the CSS is kinda problematic):

Ajax IME, Web-based Japanese Input Method, can adapt to any website (but by default the CSS is kinda problematic):
* Demo+info https://shogo82148.github.io/AjaxIME/
* Client and conversion server code: https://github.com/shogo82148/AjaxIME
* Dokodemo Ajax IME bookmarklet: javascript:``(function(){var s=document.createElement('script');s.charset='UTF-8';s.onload=function(){ImeInit();ImeChangeMode();};s.src='https://shogo82148.github.io/AjaxIME/ime.js';document.body.appendChild(s);})();
* Ajax IME - How to Write Japanese on Computer: https://comoaprenderjapones.net/en/ajax-ime-write-in-japanese-on-computer/