When I use 3d transforms to move divs around on my HTML5 web site (for iPad) I see unusual results. I will fly a div from the top down to the screen, but then after I remove it (slide it back up) there are times when it will flash on screen. It flashes often when the page is scrolled after it has hidden itself. It's as if the 3d engine has to refresh the page somehow and it thinks the div is still there, until it removes it (for a split second). What might I need to change to avoid this annoying side effect?