## Input (typing) feature

Check:

* normal typing,
* typing into non-collapsed selection,
* typing when the entire content is selected - new content should be wrapped in a paragraph.

### IME

* Hiragana,
* Spanish-ISO: accent (it's under `'`) + "a",
* MacOS: long "a" press (accent balloon).

### Undo

* undo step = 20,
* additional step marks:
  * changing the selection,
  * applying inline style to collapsed selection,
  * any other changes.

### Misc

* spell checker,
* Safari: autocorrection balloon.
