Inserting IME text@1.1
In an existing contenteditable with “Hello World” in it, putting the cursor at the end of the editor and then tying “ ko<enter>” using a Japanese IME keyboard (Hiragana). Ending up with Hello World こ.

Chrome (Desktop)

Safari (Desktop)

Firefox (Desktop)

Android API 28 with Japanese (QWERTY)

Android API 28 with Japanese (12 Keys)

Android API 27

No Japanese Support

Android API 26

No Japanese Support

Android API 25

No Japanese Support

Android API 24

No Japanese Support

Android API 23

No Japanese Support

iOS 11.4

For iOS, I didn’t tap space. Couldn’t find it in keyboard. And to complete the word, I didn’t hit enter. Instead I tapped the Japanese character on the auto-suggest to complete it.