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→Mouse wheel transaction
And there is another example, when the user is scrolling the page body, the sub-frame may come under the mouse cursor. Then, the sub-frame intercepts the mouse wheel events unexpectedly.
We can fix these problems by a simple idea. That is, all users may want to scroll only one scrollable frame at one time. So, we can assume that two or more mouse wheel events which are fired between short term should scroll only one scrollable frame. The frame must be the frame under the cursor at the first mouse wheel event.
Gecko manages this transaction by nsMouseWheelTransaction which is in [http://mxr.mozilla.org/mozilla-central/source/content/events/src/nsEventStateManager.cpp nsEventStateManager.cpp]. This was implemented in [https://bugzilla.mozilla.org/show_bug.cgi?id=312831 bug 312831].
