Some event listeners, such as "scroll" (e.g. for window or body) or
timers, are quietly disabled (without application receiving any
notification) when user clicks a link on the page and then comes back
using Back key on the browser.

iPhone Safari just restores the cached page (without even telling
server, let alone the app), but with some event listeners simply
dropped.

Application has no way of knowing its event listeners have become
inactivated, or even that the page itself has become active again (no
events tell it that they the page is back). Since timers are also lost
after Browser Back, it can't even poll to find out it is back and
reinsert the event listeners.


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