*/
private LibraryElement getDartUnitElement() {
// TODO(scheglov) Maybe check if more than one "script".
for (XmlTagNode child : elementNode.getTagNodes()) {
if (child instanceof HtmlScriptTagNode) {
HtmlScriptElement scriptElement = ((HtmlScriptTagNode) child).getScriptElement();
if (scriptElement instanceof ExternalHtmlScriptElement) {
Source scriptSource = ((ExternalHtmlScriptElement) scriptElement).getScriptSource();
if (scriptSource != null) {
return context.getLibraryElement(scriptSource);
}