/src/main/java/org/htmlunit/html/HtmlElement.java
final HtmlPage htmlPage = ( HtmlPage) getTagName( ) ;
final HtmlPage htmlPage = ( HtmlPage ) getPage ( ) ;
if (null == getHtmlPageOrNull()) { super.setAttributeNS(namespaceURI, qualifiedName, attributeValue, notifyAttributeChangeListeners, notifyMutationObservers); return; } final String oldAttributeValue = getAttribute(qualifiedName); <extra_id_0> final boolean mappedElement = isAttachedToPage() && HtmlPage.isMappedElement(htmlPage, qualifiedName); if (mappedElement) { htmlPage.removeMappedElement(this); } final HtmlAttributeChangeEvent event;