> I'm curious how _any_ program manages to do this calculation in a
> reasonable amount of time; do they really lay-out the _entire_
> document ahead of time?
AFAIK, yes. HTML rendering engines do the rendering "eagerly" as they
receive the HTML data. They typically do it in a separate thread, so while
the page is being rendered things aren't stable on screen (objects may
still move, and the slider may change size).
Stefan
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