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.