css - Transitioning Transforms in Safari look terrible/shaky/stuttering -


i have few functions based on scrolling user moves elements , down along page (imitating scroll effect.)

in order make little smoother using transition: transform 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85); (with proper vender prefixing).

the problem works great except in safari. there -webkit-transition: -webkit-transform 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85); causes animation jerk around , gives vibrating effect. have been reading on ages , have tried setting perspective property , backface properties no luck.

is there way fix this/has seen this? , safari not allow transitioning transforms?

any in understanding problem amazing.

i found fiddle http://jsfiddle.net/3yfspjlt/ shows problem. if doesn't blink @ first keep scrolling , down.

for curious code, more curious why bug happens in safari specific use case. (although of course trying find answer).

js file

getelementpositions: function(){      var de = document.documentelement;     var windowhight = window.innerheight;       var page = scrollanimations.gettopbottom(scrollanimations.featurepage, de, windowhight);     var profile = scrollanimations.gettopbottom(scrollanimations.featureprofile, de, windowhight);     var barone = scrollanimations.gettopbottom(scrollanimations.firstbar, de, windowhight);     var bartwo = scrollanimations.gettopbottom(scrollanimations.secondbar, de, windowhight);     var barthree = scrollanimations.gettopbottom(scrollanimations.thirdbar, de, windowhight);      scrollanimations.pagediff = page.diff;     scrollanimations.pagestartp = page.top - (page.padding -100);      scrollanimations.profilediff = profile.diff;     scrollanimations.profilestartp = profile.top - (profile.padding/1.3);       scrollanimations.baronediff = barone.diff;     scrollanimations.baronestarttop = barone.top - (barone.padding/1.3);       scrollanimations.bartwodiff = bartwo.diff;     scrollanimations.bartwostarttop = bartwo.top - (bartwo.padding/1.3);      scrollanimations.barthreediff = barthree.diff;     scrollanimations.barthreestarttop = barthree.top - (barthree.padding/1.3);      scrollanimations.startscrollanimations();   },    gettopbottom: function(el, de, windowhight) {     var result = {};     var box = el.getboundingclientrect();     result.top = box.top + window.pageyoffset - de.clienttop;     result.bottom = box.bottom + window.pageyoffset - de.clienttop;     result.diff = result.bottom - result.top;     result.padding = windowhight - result.diff;     return result;   }, scrollpage: function(scrollpos){     var pageheight = scrollanimations.pagescroll.offsetheight;     var scrolldiff = scrollpos - scrollanimations.pagestartp;     var realpos = -scrolldiff/scrollanimations.pagediff;     var lengthleft = pageheight - scrollanimations.pagediff;      if (realpos > 0.09) {       transy = 0.09 * lengthleft;     } else if(realpos < -1) {       transy = -1 * lengthleft;     } else {       transy = realpos * lengthleft;     }      scrollanimations.pagescroll.setattribute('style', '-webkit-transform:translate3d(0,' + transy + 'px,0); -moz-transform:translate3d(0,' + transy + 'px,0); -ms-transform:translate3d(0,' + transy + 'px,0); transform:translate3d(0,' + transy + 'px,0);');         if(modernizr.orientation) {         scrollanimations.pagescroll.style.transformstyle='preserve-3d';         scrollanimations.pagescroll.style.webkittransition='0.4s cubic-bezier(0.49, 0.47, 0.63, 0.85)';       }    },

css (i have tried using all)

#page-scroll {     -webkit-transition: -webkit-transform 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85);     -moz-transition: transform 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85);     -ms-transition: transform 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85);     -o-transition: transform 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85);     transition: transform 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85);   }

i'm not 100% sure you're trying accomplish try below...? let know if helped, if not elaborate more on question please or add more of source codes.

/* add translatey values */ -webkit-transform: translatey(100px); -moz-transform: translatey(100px); transform: translatey(100px);  -webkit-transition: 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85); -moz-transition: 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85); transition: 0.7s cubic-bezier(0.49, 0.47, 0.63, 0.85);

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