When I display a page on my phone, the widget bar is at the bottom of the screen. When I scroll the page, the widget bar moves up the screen. See the attached screenshot. It is a Samsung Salaxy Q, running Android 2.3.6. The URL is http://ctwist.jalbum.net/mirage_videos/index.html
On PCs and some other mobile devices, the widget bar is always anchored to the bottom of the screen.
Yes, I can reproduce the bug now with Opera. Unfortunately I thinks it's a bit low prio bug (if even solvable), since it works in a modern browser. But if someone knows how to fix it, I'd gladly implement it.