How to Undo a Typing Mistake on a Chromebook

What you need: A Chromebook with Chrome open on a web page with a box where you were typing and made a change you did not want.

Steps

1. Stop typing when you notice the change.
2. Click inside the box where the change happened.
3. Hold down Ctrl, near the lower-left corner of the keyboard. While holding it, press Z once, then let go of both keys. The most recent change is reversed.
4. Look at the text. If the unwanted change is not fully reversed, hold Ctrl and press Z again, then let go of both keys. Repeat until the text is as you want it, then stop: each further press reverses an earlier change.

Expected result: The unwanted typing change has been reversed.