131440 2014-04-09 09:19:43 -0700 [CSS Regions] Scrollable elements flowed into regions do not scroll in some situations 2014-04-10 06:20:30 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Unspecified Unspecified RESOLVED INVALID AdobeTracked P2 Normal --- 57312 1 stavila stavila oldest_to_newest 999202 0 stavila 2014-04-09 09:19:43 -0700 If an element with overflow:scroll is flowed into a region, scrolling it using the mouse wheel only works if the OS is configured to always show the scrollbar. Otherwise, scrolling with the wheel doesn't work. 999517 1 stavila 2014-04-10 06:20:30 -0700 This happens when the mouse is positioned over a part of the scrollable element which is behind another region, in which the element does NOT flow. Not responding to the wheel event in this situation is normal behavior and happens in the same way when not using regions if the elements are self-painting layers (as regions are).