/**
* Returns the associated style-sheet.
*/
public StyleSheet getCSSStyleSheet() {
if (styleSheet == null) {
HashTable attrs = getPseudoAttributes();
String type = (String)attrs.get("type");
if ("text/css".equals(type)) {
String title = (String)attrs.get("title");
String media = (String)attrs.get("media");
String href = (String)attrs.get("href");
String alternate = (String)attrs.get("alternate");
SVGOMDocument doc = (SVGOMDocument)getOwnerDocument();
ParsedURL durl = doc.getParsedURL();
ParsedURL burl = new ParsedURL(durl, href);
CSSEngine e = doc.getCSSEngine();