Rewrite rules for attributes of html content applied to a filter don't work

If you are to apply rules to a filter with html content, the rules don't get applied to the attributes.

e.g.

 <filter name="AMBARIUI/ambari/outbound/mainpage">
        <content type="*/html">
            <apply path="stylesheets/vendor.css" rule="AMBARIUI/ambari/outbound/vendorcss"/>
        </content>
    </filter>

will not rewrite the attribute value of stylesheets/vendor.css in a html page. A similar construct works for Javascript content.