In my testing it does. If you've set that option and it doesn't look any different, then perhaps the element you're attaching to is the full size of the page? The attach-to-element feature is for people who say, only wanted to cover the header of their site. There's some hack in there to figure out the position and height of that element and have the popover cover that (also, if the element is too small, the popover might be larger such that the message shows). Always open to bug reports.