safari 8

[TimWillis]

This does not work with safari 8 iphone and mac.

        snabbt(element, {
            position: [0, start_top - height, 0],
            easing: 'easeOut',
            duration: 250
        });

because it only adds transform to the element's style. For safari 8 it has to have webKit transform.

    setTimeout(function () {
        element.style.webkitTransform = element.style.transform;
    }, 250);