CSS3 Click Chart | CSS3 Browser Support and Information

@namespace

Lets you to define an XML namespace prefix in CSS, allowing the use of selectors that match elements in a specific namespace.

@namespace "http://www.w3.org/1999/xhtml";
@namespace svg "http://www.w3.org/2000/svg";

svg|p {
    color: hotpink;
}

For a live demonstration of CSS namespaces, visit this link in a supporting browser.

Firefox (?)