In message , Jean Fredette
writes:
"J. P. Gilliver (John)" posted:

Surely for the speedtests at least, any answer that lets you do that
will make the speedtest invalid?

I'm not sure what you mean.

I chose the speedtest as a simple example of the problem that many web
pages just STOP working when you simply change the browser tab focus
and do nothing else different.
[]
Can you clarify your question?

I see; you were just using the speedtest as an example of a page that
stops working when it isn't the primary tab (I would have said "doesn't
have focus", but as Paul has pointed out, that has a specific meaning
relating to Windows as a whole rather than browser tabs). You weren't
trying to run an actual valid speed test. (Which obviously does need to
both be the primary tab and for there to be no other online activity for
the actual speed test to give a valid result.)
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

Never make the same mistake twice...there are so many new ones to make!