css - Fixed position misbehaviour in IE11 -

i experiencing elements position misbehaviour page, in ie(11) only; live link here. logotext, menu , left sidebar text, remain in place doesn't move wrapper when left slider open (clicking on info+ button). i've read position: fixed + transition in ie problems.

i've tried apply position: expression(fixed); header went wrong , wrapper receive brake-movement @ open/closing slider. (the sidebar didn't work position: expression(fixed);)

also i've tried tweak css modifying element position values in static/ absolute without succees.tests made in full screen, theme not mobile screens.any thoughts?

le: i've found possible solution works slider in ie11:

.header {   position: absolute; }  .bar-side {   position: absolute; } 

will work slider move on vertical scroll.if ca fix somehow, solution.

for quick solution add transform separately ie, in ie css hack.

@media screen , (-ms-high-contrast: active), (-ms-high-contrast: none) {   .header, #bar-left{       left: 0;       transition: .5s;   }   .shiftnav-open .header, .shiftnav-open #bar-left{      left:590px;   } }