Hide navigation bar on iphone. It will appear only with a double tap on header

snippet.js

$(document).on('touchmove',function(e){
	e.preventDefault();
});

$('body').on('touchstart','.scrollable',function(e) {
	if (e.currentTarget.scrollTop === 0)
		e.currentTarget.scrollTop = 1;
	else if (e.currentTarget.scrollHeight === e.currentTarget.scrollTop + e.currentTarget.offsetHeight)
		e.currentTarget.scrollTop -= 1;
});

$('body').on('touchmove','.scrollable',function(e) {
	e.stopPropagation();
});

$(window).load(function () {
	$('body').scrollTop(0,0);
});