[sniperjzp]

Not sure about Teams, but Google Meet allow you to share a specific browser tab, I don't know how to implement it without reading all the opened tabs.

[meibo]

There is a JavaScript API that abstracts this, so Google Meet/whatever asked can only read the "final" video stream of what you selected and not everything that's going on, which stays in your local browser.

[Flame]

Teams lets you share an application window or your display(s).

[saikan]

and "Window sharing isn't available for Linux users." https://support.microsoft.com/en-us/office/share-content-in-...