Const
Fallback page height (px) for DOM_DELTA_PAGE when the element's own clientHeight is unusable. A detached or not-yet-laid-out element reports 0, and a 0-px page would silently swallow the event.
DOM_DELTA_PAGE
clientHeight
Fallback page height (px) for
DOM_DELTA_PAGEwhen the element's ownclientHeightis unusable. A detached or not-yet-laid-out element reports 0, and a 0-px page would silently swallow the event.