/usr/lib/python2.7/dist-packages/cssutils/tests/sheets/cases.css is in python-cssutils 1.0.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | @import url("a");
b{color:red}
a{float:left;bogus:foo(a, url(a))}
b{color:red}
|