How refresh is different from clicking "Go"; Refresh; F5; Ctrl+F5; Ctrl+R

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cached refresh:     form:         input retains value         textarea retains value         select retains selected     img:         revalidate request sent (slower)   go:     form:         input value reset         textarea value reset         select selected reset     img:         HTTP_IF_MODIFIED_SINCE (faster)   no cache refresh:     form:         input value reset         textarea value reset         select selected reset