## New undo step on applying attribute ([#21](https://github.com/ckeditor/ckeditor5-typing/issues/21)) *Every attribute change should create a new undo step.* **Check**: 1. Type few letters. 1. Press styling button (italic, bold, etc). 1. Type few more letters. 1. Press undo button. **Expected**: Only the letters typed in step 3 should be undone. 5. Press undo button. **Expected**: Letters typed in step 1 should be undone.