if (n.getFirstChild() != null) {
String text = n.getFirstChild().getNodeValue();
CssTree.StyleSheet css = css(fromString(text, pos));
CssRewriter rw = new CssRewriter(
null, CssSchema.getDefaultCss21Schema(mq), mq);
rw.rewrite(AncestorChain.instance(css));
CssDynamicExpressionRewriter rrw =
new CssDynamicExpressionRewriter(meta);
rrw.rewriteCss(css);
assertMessagesLessSevereThan(MessageLevel.ERROR);
styles.add(new ValidatedStylesheet(