How to Enable Windows Spellchecker in Google Chrome
Microsoft is working with Google in the Chromium project to add the Windows Spellchecker API to Chromium-based browsers, including Chrome and Edge. The browsers will be able to use it on Windows 8.1 and above. In Microsoft Edge, Windows Spellchecker is enabled out of the box starting in Edge version 83. In Google Chrome, you need to turn on it with a flag.