Rule no-url-protocols
will enforce that protocols and domains are not used within urls.
When enabled, the following are allowed:
.foo {
background-image: url('/img/bar.png');
}
.foo {
background-image: url('img/bar.png');
}
.foo {
background-image: url('bar.png');
}
When enabled, the following are disallowed:
.foo {
background-image: url('https://foo.com/img/bar.png');
}
.foo {
background-image: url('http://foo.com/img/bar.png');
}
.foo {
background-image: url('//foo.com/img/bar.png');
}