When will a memory pressure event be delivered

[jeisinger]

e.g. in this chromium issue the time between when the OS gets under memory pressure to when the app dies is shorter than the time it takes for control to return to the message loop. In situations like this, I'd assume that delivering a DOM event won't work either.

I also expect that it's not uncommon that the foreground tab is actually the cause of memory pressure.

How does this API work in these situations?

[Akxe]

It should be upon hitting some treshold. If someone has memory intense loop it might crash even while implementing memorypresureevent.

The treshold will be kept on browser not to leak any user info. I would think it even could be randomised.