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→Gecko honors mouse cursor position
This first version is written for Gecko 1.9.2. But this document isn't stable, so, when this document will be updated for new behavior, the writer must write the version clearly.
= Gecko honors the mouse cursor position =
Basically, turning mouse wheel scrolls a scrollable view under the mouse cursor. This behavior was designed in [https://bugzilla.mozilla.org/show_bug.cgi?id=97283 bug 97283].
Note that on Windows, most mouse drivers honors keyboard focus rather than the mouse cursor position. However, Internet Explorer and other web browsers honor the cursor position too. So, it's not a problem, probably.
When there are two or more scrollable frames under the mouse cursor, only one frame should be scrolled. Gecko decides one scrollable frame for the target by following rules:
# Finds a frame under the mouse cursor.
# Checks whether the frame is scrollable to the direction by user operation.
# If the frame is scrollable, Gecko scrolls the frame.
