[css3-background] Background positioning area of root element when background-attachment is fixed


http://www.w3.org/TR/css3-background/#special-backgrounds says
"the background positioning area is determined as for the root element".
However I tested several browsers (Chrome, IE10, Firefox, Safari) and they
all seem not to conform this.

Test case is like:
<!DOCTYPE html>
body {
  background-image: linear-gradient(white, yellow);
  background-attachment: fixed;

http://jsbin.com/pepufelo/1/ (gradient) and
http://jsbin.com/pepufelo/2(real image with background-size: 100%
100%) also allow you to toggle
between 'fixed' and 'scroll' background-attachment by clicking on the page.

On my tested browsers, when background-attachment is fixed, the viewport
(instead of the root element) is used as the background positioning area.
I'm wondering if this behavior has been specified or is a known issue.


Received on Thursday, 22 May 2014 19:15:54 UTC