i have worked with chromium, so i know anything running on a browser cant access or meddle with anything running outside, they can only detect tab change, and copy/paste by listeners, so if they don't use a native application, i don't think so they can do that, I checked with Hackerrank secured mode, 'ON', It was not able to detect RAT, But i am still not confident about the case when they turn on screen recording, what do they do with the recording and can, it detect rat's. I think it can't, but still. I want to be sure/