NEED TO REVISE SOME TESTS. I tested auto-correct not auto-suggest in some browsers.
In an existing contenteditable with“Hello World” in it, putting the cursor at the end of the editor and then typing “ wasn” until auto-suggest suggests wasn't. Click the auto-suggestion.
Chrome (Desktop)
Safari (Desktop)
Firefox (Desktop)
Android API 28
Android API 27
Android API 26
Android API 25
Android API 24
Android API 23
iOS 11.4