Freeze game time when the browser becomes hidden
The practical problem
A timed stage may expire while the user answers a call or switches apps, punishing unavoidable interruptions.
Implementation protocol
Use visibilitychange to freeze simulation time, hold remaining countdown and resume on an explicit user action. Record state in memory before the page hides.
Worked scenario
If a player had 18 seconds remaining, returning after a minute should not create a huge physics time step or instantly end the round.
What could go wrong
Discarding elapsed time without resetting the frame clock can still move objects abruptly.
Acceptance criteria
Test app switching, screen locking and landscape rotation.
Source material and evidence boundaries
For the topic Freeze game time when the browser becomes hidden, use the sources listed below to check relevant methods. Any worked figures illustrate a scenario, not measured MojPlayWin performance. Consult the shared evidence standards before applying the method.