javascript - How to make absolute positioning images to stay fixed like background-attachment: fixed; -


i use backstretch.js cross browser background images cover. how can set images stay fixed on block background-attachment: fixed ?

i know there jquery way set background-image positioning fixed cross browser

$(window).scroll(function() {   var scrolledy = $(window).scrolltop();   $('.first-block').css('background-position', 'center ' + ((scrolledy)) + 'px'); });

but code freezes in mac os , ios.. there method add code images not background images? or method remove freezes..? if there not freezes i'll delete backstretch.js , make scrolling background images..

jsfiddle demo 1 on demo can see emulating background-position: fixed jquery. freezes on mac os , ios. on windows fine! how can remove freezes?

jsfiddle demo 2 on demo can see action backstretch.js makes full size images cross browser. how can set scroll in demo 1 ?


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