Bugzilla – Bug 20587
[cssom] ensure stylesheet uniqueness when loading >1 time from same source
Last modified: 2013-08-08 13:26:26 UTC
ensure that the following are specified:
* Given two CSSImportRule objects with the same href, their styleSheet attributes are not the same object.
* Changing one (eg. through .insertRule()) does not affect the other.
see also http://lists.w3.org/Archives/Public/www-style/2012Dec/0350.html