It's by design. The behavior provides smoother scrolling for users. The detail value of DOMMouseWheel indicates the amount of lines to be scrolled on the nearest ancestor scrollable element of the event target. So, if you need to accumulate the each event's delta value and when it reaches good amount, you should do something to do.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 6 years ago
Resolution: --- → INVALID
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