The team is currently working on this. I will let you know when I have more updates.
Work has been done by the team to add support for partial strings. They are continuing to work on improving the experience.
Screen sharing on Chrome and Chromium-based Edge is now supported. We also have released support for joining meetings from Safari, Firefox and IE browsers, with some limitations. For details, please see the following link: https://docs.microsoft.com/en-us/microsoftteams/limits-specifications-teams#browsers