3 ms·

onunload/onbeforeunload doesn't work?

• jen20 5y ago
  What if they kill -9 the browser process?
• inglor 4y ago
  Not always, not necessarily if the tab was in the background when closed (switch then close), not if they force quit (like the other comment I upvoted says), not if chrome updates etc. The other alternatives are opening another type of connection like an RTCPeerConnection to your server and seeing when that closes.