styleSheet = (StyleSheet) baseStyleSheet;
} else if (baseStyleSheet instanceof CSSStyleSheet) {
CSSStyleSheet cssStyleSheet = (CSSStyleSheet) baseStyleSheet;
CSSParserMode parserMode = cssStyleSheet.getParserMode();
String css = cssStyleSheet.getCSS();
// Prefix sufficient blank lines and white space to the front of
// the CSS to ensure that any line and column numbers that the
// parser reports are correct relative to the source XML.