In this episode, Tyler demonstrates the VoiceOver Text Checker on macOS, a feature that identifies common errors in typed text such as misspellings, repeated spaces, and misplaced capital letters.
This feature can be accessed via Keyboard Commander, and by default is mapped to the letter D. When in a text field, pressing this command should present menus for the types of errors identified in the text, such as misspellings, white space, etc.