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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
  
  <script>
    // creates a global "addWheelListener" method
// example: addWheelListener( elem, function( e ) { console.log( e.deltaY ); e.preventDefault(); } );
(function(window,document) {
​
    var prefix = "", _addEventListener, onwheel, support;
​
    // detect event model
    if ( window.addEventListener ) {
        _addEventListener = "addEventListener";
    } else {
        _addEventListener = "attachEvent";
        prefix = "on";
    }
​
    // detect available wheel event
    support = "onwheel" in document.createElement("div") ? "wheel" : // Modern browsers support "wheel"
              document.onmousewheel !== undefined ? "mousewheel" : // Webkit and IE support at least "mousewheel"
              "DOMMouseScroll"; // let's assume that remaining browsers are older Firefox
​
    window.addWheelListener = function( elem, callback, useCapture ) {
        _addWheelListener( elem, support, callback, useCapture );
​
        // handle MozMousePixelScroll in older Firefox
        if( support == "DOMMouseScroll" ) {
            _addWheelListener( elem, "MozMousePixelScroll", callback, useCapture );
        }
    };
​
    function _addWheelListener( elem, eventName, callback, useCapture ) {
        elem[ _addEventListener ]( prefix + eventName, support == "wheel" ? callback : function( originalEvent ) {
            !originalEvent && ( originalEvent = window.event );
​
            // create a normalized event object
            var event = {
                // keep a ref to the original event object
                originalEvent: originalEvent,
                target: originalEvent.target || originalEvent.srcElement,
                type: "wheel",
                deltaMode: originalEvent.type == "MozMousePixelScroll" ? 0 : 1,
                deltaX: 0,
                deltaZ: 0,
                preventDefault: function() {
                    originalEvent.preventDefault ?
                        originalEvent.preventDefault() :
                        originalEvent.returnValue = false;
                }
            };
            
            // calculate deltaY (and deltaX) according to the event
            if ( support == "mousewheel" ) {
                event.deltaY = - 1/40 * originalEvent.wheelDelta;
                // Webkit also support wheelDeltaX
                originalEvent.wheelDeltaX && ( event.deltaX = - 1/40 * originalEvent.wheelDeltaX );
            } else {
                event.deltaY = originalEvent.detail;
            }
​
            // it's time to fire the callback
            return callback( event );
​
        }, useCapture || false );
    }
​
})(window,document);
  </script>
</head>
<body style="overflow:hidden;">
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  <textarea id="debug-textarea" style="width: 100%; height: 300px"></textarea>
  <div id="vimeo-iframe-con" style="width: 200px; height: 200px; position:relative;">
  <iframe id="vimeo-iframe" scrolling="yes" src="https://player.vimeo.com/video/28292213?api=1&amp;player_id=vimeoplayer28292213" width="100%" height="300px" frameborder="0" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen="" style="width: 100%; height: 100% position: absolute; z-index:-10;"></iframe>
    <div id="vimeo-iframe-con2" style="width: 100%; height: 100% position: absolute; z-index:20;"></div>
  </div>
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  <script>
    /*
    function handle_wheel(){
      document.getElementById("debug-textarea").value = document.getElementById("debug-textarea").value+' scroll';
    }
                    if (window.addEventListener){
                        document.body.addEventListener('DOMMouseScroll', function(e){
                          handle_wheel();
    e.preventDefault();
}, false);
                    }else{
                    }
                    window.onmousewheel = handle_wheel;
    
    
    */
    var mouseDown = false;
​
function handle_wheel(e) {
    console.log(e);
    if (!mouseDown) {
        document.getElementById("debug-textarea").value = document.getElementById("debug-textarea").value + ' wheel';
    } else {
        document.getElementById("debug-textarea").value = document.getElementById("debug-textarea").value + ' scroll';
    }
}
​
window.onscroll = handle_wheel;
window.onmousedown = function () {
    mouseDown = true;
}
window.onmouseup = function () {
    mouseDown = false;
}
  </script>
</body>
</html>
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