Editing text in the "div" with "contenteditable=true" necessitates moving the cursor back to the controls. A lot more time is needed then is currently given. When dropdown menus for heading styles or insert emoJi are opened they auto-close after a very short time. This makes the editing controls practically unusable especially with the keyboard but also for pointer users that need more time.
https://report.bitvtest.de/default-en/cbedb5ef-4815-4cba-a83d-995599c178c3.html#checkpoint-2c3b5688b6-v3-n1
9.2.2.1/11.1 - https://report.bitvtest.de/default-en/cbedb5ef-4815-4cba-a83d-995599c178c3.html#checkpoint-2c3b5688b6-v11-n1