visibilitychange event should fire as part of unload process and document.visibilityState should report 'hidden'.
Status in Chromium
Enabled by default (tracking bug) in:
- Chrome for desktop release 56
- Chrome for Android release 56
Consensus & Standardization
After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.
- No signal
- No signals
Last updated on 2020-11-09