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Position fixed doesn't work with transform CSS property. It happens because transform creates a new coordinate system and your position: fixed element becomes fixed to that transformed element. To fix the problem you can remove transform CSS property from the parent element.
position: sticky that is a new way to position elements that is conceptually similar to position: fixed . The difference is that an element with position: sticky behaves like position: relative within its parent, until a given offset threshold is met in the viewport.
position: fixed doesn't work on iPad and iPhone.
A fixed position element is positioned relative to the viewport, or the browser window itself. The viewport doesn't change when the window is scrolled, so a fixed positioned element will stay right where it is when the page is scrolled.
The CSS Transforms spec explains this behavior. Elements with transforms act as a containing block for fixed position descendants, so position:fixed under something with a transform no longer has fixed behavior.
They do work when applied to the same element; the element will be positioned as fixed, and then transformed.
After some research, there has been a bug report on the Chromium website about this issue, so far Webkit browsers can't render these two effects together at the same time.
I would suggest adding some Webkit only CSS into your stylesheet and making the transformed div an image and using it as the background.
@media screen and (-webkit-min-device-pixel-ratio:0) {
/* Webkit-specific CSS here (Chrome and Safari) */
#transformed_div {
/* styles here, background image etc */
}
}
So for now you'll have to do it the old fashioned way, until Webkit browsers catch up to FF.
EDIT: As of 10/24/2012 the bug has not been resolved.
This appears to not be a bug, but an aspect of the specification due to the two effects requiring separate coordinate systems and stacking orders. As explained in this answer.
Something (a bit hacky) that worked for me is to position:sticky instead:
.fixed {
position: sticky;
}
For anyone who finds their background images are disappearing in Chrome because of the same issue with background-attachment: fixed; - this was my solution:
// run js if Chrome is being used
if(navigator.userAgent.toLowerCase().indexOf('chrome') > -1) {
// set background-attachment back to the default of 'scroll'
$('.imagebg').css('background-attachment', 'scroll');
// move the background-position according to the div's y position
$(window).scroll(function(){
scrollTop = $(window).scrollTop();
photoTop = $('.imagebg').offset().top;
distance = (photoTop - scrollTop);
$('.imagebg').css('background-position', 'center ' + (distance*-1) + 'px');
});
}
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