Recording this tab is the only case where a browser knows where your pointer is, so it is the only case where the zoom can follow your cursor exactly. Recording anything else still works: the zoom follows where the picture changes instead, which needs no cursor at all.
Recordings kept here
Nothing saved yet
A recording is kept in this browser as soon as it stops, so closing the tab or reloading will not lose it.
Nothing recorded yet.
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Background
Zoom
The cursor and the ripples need a pointer track, so they only appear when you recorded this tab.
Camera and output
Roughly . Every frame is drawn and encoded one at a time, so a long recording takes a while and comes out exactly as the preview shows it.