HTML5 export can't use windows IME

[renleidedadi]

Godot version:
v3.3.stable.official

OS/device including version:
Windows 10 19042.928
Browser: Chrome, Edge

Issue description:
Can't use IME in HTML5 export, but can use the IME in desktop export. Hope to use IME in HTML5.

Steps to reproduce:
1.New project
2.add a LineEdit or TextEdit
3.add HTML5 export
4.Run in browser
5.Use windows IME to input content in LineEdit or TextEdit

For example, this is Chinese IME:

Minimal reproduction project:
New project, add a LineEdit or TextEdit, add font.

[akien-mga]

CC @Faless @bruvzg

[Faless]

Same issue as #45904 .
IME support in browsers is limited to input and textarea. Does not apply to canvas element.

[akien-mga]

Closing as duplicate of #45904 then (I edited the title to reflect that it also includes IMEs).

[renleidedadi]

Thanks