> I thought that javascript could be used without page reload or server
> requests?

It can of course, but you have to write code that does something.
There's not much value in creating the iframe before you need it with
parameters that don't relate to a button that hasn't been pressed yet.

You might instead, for example, write some code that creates the
iframe on demand, using parameters selected by which button was
clicked.  That needn't involve cookies at all, though you might have
some other reason for using cookies.  None of this has much to do with
maps.

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