Forcerepaint

$("html, body").animate({ scrollTop: 0 }, {
	duration: 250,
	complete: function() {
		var elem = document.documentElement;
		// setting a padding top on document element will force repaint, but not show any visual effect
		elem.style.paddingTop = '1px';
		setTimeout(function() {
			elem.style.paddingTop = '0';
		}, 0);
	}
});