def = new HTMLPurifier_AttrDef_CSS_Background($config);
        $valid = '#333 url("chess.png") repeat fixed 50% top';
        $this->assertDef($valid);
        $this->assertDef('url(\'chess.png\') #333 50% top repeat fixed', $valid);
        $this->assertDef(
            'rgb(34, 56, 33) url(chess.png) repeat fixed top',
            'rgb(34,56,33) url("chess.png") repeat fixed top'
        );
    }
}
// vim: et sw=4 sts=4