English: This is a Self-XSS attack warning, shown in by Google Meet* platform(meet.google.com). It is shown in the console of a browser, when a user leaves a Meeting at Google Meet and the screen says "You left the meeting"
Note that this this warning is shown to everyone and is NOT because any occasional technical errors or glitch. This warning does NOT reduces any privacy or security to any users, as long as they did not enter any command, that they don't fully understand, in the browser's console
*Google is a registered trademark in the US and other countries. Meet is a online video conference service offered by Google