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it's like IE->tools->options->general->**temp**->set**->auto**
in old version of opera: back/foward/navigate will not check img/scripts, only document
even you press F5,ctrl+f5
if HTTP header tells opera it's cachable, it don't even reload document
it's bad for dyn-pages for BACK/FORWARD, cos dyn-pages have to tell opera not to cache, and still not able to reload-script when refresh, this is evil for webdevelopers
in ie, back/foward/navigate is same as old opera
but a refresh will cause checking scripts/document
an ctrl+f5 will check everything with "no-cache"
it's nice for dyn-pages, that allow caching and sill dyn
i thought the way IE does is the best for both static-page and dyn-page
ie7.10 changed it's old behavior, getting close to IE
but not exactly the same as ie
I'd hate to 'upgrade' and lose that functionality. I've done that too often with too much software.
i'm compareing old opera/ie/new opera
while document is cachable, and cached
old opera: load cached data even u press F5/ctrl+F5
ie: often load cached data, but check date when f5(even cachable), and reload whole file when ctrl+f5(even cached)
new opera: load cached data when back/forward/navigate to new page
but for F5/ctrl+F5: check all date of non-document resources
differences is that i don't know which hotkey/function is equal to ie's CTRL+F5 which use "no-cache"