running headers not cleared when class contains multiple classes

[GoogleCodeExporter]

Within a @page rule
    @top-left { 
        content: element(running-1, first);
    }
    @top-right { 
        content: element(running-2, last); 
    }
    @bottom-right { 
        content: element(running-2, last); 
    }

<h1 class='running-1'>one</h1>
<div class='running-2 running-3 running-4'> </div>

The div is supposed to clear the header but this does not work when multiple 
classes are listed. If a single class is listed, it actually does work.

I am using 9.0.4 on MacOS

Original issue reported on code.google.com by pkri...@gmail.com on 19 Dec 2013 at 10:33