Mouse scroll

    elem.addEventListener("wheel", function(e) {
        document.querySelector("#wheel").innerText =
            "type: " + e.type +
            "\nbutton: " + e.button +
            "\ndetail: " + e.detail +
            "\nisPrimary: " + e.isPrimary +
            "\npointerType: " + e.pointerType +
            "\npressure: " + e.pressure +
            "\nwhich: " + e.which +
            "\ndeltaMode: " + e.deltaMode +
            "\ndeltaX: " + e.deltaX +
            "\ndeltaY: " + e.deltaY +
            "\ndeltaZ: " + e.deltaZ +
            "\nwheelDelta: " + e.wheelDelta +
            "\nwheelDeltaX: " + e.wheelDeltaX +
            "\nwheelDeltaY: " + e.wheelDeltaY +
            "\n" +
            "\nctrlKey: " + e.ctrlKey +
            "\naltKey: " + e.altKey +
            "\nmetaKey: " + e.metaKey +
            "\nshiftKey: " + e.shiftKey;
    });