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Using this , you can use IME on Unity WebGL content.
You can do "copy&paste" or input some characters which depends on IME.
Replace "UnityEngine.UI.InputFiled" to "WebGLNativeInputField" which I made.
We prepared two method.
You can choose which one on Inspector.
1.Popup dialog which is created by "window.prompt".
2.Overlay html which is created by javascript dynamically.