Occasionally, when I move my mouse cursor up to where my tabs are, a website will pop up with something to try and entice me to stay-- an advertisement for other content they have on their site, or a sale offer, or something.
How does the website know where I’ve moved my mouse cursor to?
I got pretty weirded out the first coupla times this happened to me. Out of nowhere, a big square in the middle of the screen pleading, “Please don’t leave!”.
And I wasn’t necessarily leaving, just going elsewhere to check something for a moment. Once I figured out what was going on, I moved the mouse very slowly to the edge, just from curiosity to see at which point it will consider me gone.