Bug 91683 – webkit-transform: operations cause incorrect browser scrollbar ranges

• Component: Layout and Rendering
• Status: UNCONFIRMED

Created attachment 153109 [details]
Sample HTML file which shows the bug.

When content contains elements modified via webkit-transforms, those transforms can cause the browser scrollbars to have incorrect ranges and result in the user not being able to scroll enough to see all of the page content.

The attached file shows an example of this.

1) open the attached web page
2) notice the red div has a 3D transform on it.
3) maximize the browser so that the entire translated div is available
4) now resize the browser (via the bottom right corner of the window) so that the edges of the red div are obscured. Notice that the scrollbars do not appear at the correct time.
5) resize even smaller, then use the scrollbars to scroll so that the entire red div is visible. The scrollbar ranges are incorrect and parts of the content cannot be properly scrolled into view.