We have SharePoint framework app embedded into a SharePoint page and added to Teams as a tab. textbox (basic HTML) start typing backwards when you move your curser outside the tab area (either to Teams chat area or side navigation).
Steps to reproduce
- Type something in the textbox (I have textbox in my SPFX webpart)
- Highlight the text with the curser and hold selection (hold left button)
- Move the mouse pointer to Teams chat area or navigation are but don’t click anything
- Start typing. Whatever you type will be backwards