How to determine scroll direction without actually scrolling

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The mousewheel event is quickly becoming obsolete. You should use wheel event instead.

This would also easily allow you to the vertical and/or horizontal scroll direction without scroll bars.

This event has support in all current major browsers and should remain the standard far into the future.

Here is a demo:

window.addEventListener('wheel', function(event)
{
 if (event.deltaY < 0)
 {
  console.log('scrolling up');
  document.getElementById('status').textContent="scrolling up";
 }
 else if (event.deltaY > 0)
 {
  console.log('scrolling down');
  document.getElementById('status').textContent="scrolling down";
 }
});
<div id="status"></div>

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