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- <script type="text/javascript">
- var scrollableElement = document.querySelector('#footer');
- document.addEventListener('wheel', function() {
- scrollableElement.style.visibility = checkScrollDirectionIsUp(event) ? 'visible' : 'hidden';
- });
- function checkScrollDirectionIsUp(event) {
- if (event.wheelDelta)
- return event.wheelDelta > 0;
- return event.deltaY < 0;
- }
- </script>
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