/src/main/java/org/htmlunit/html/DefaultElementFactory.java
element = new HtmlAbbreviated( qualifiedName, page, attributeMap) ;element = new HtmlHeading4( qualifiedName, page, attributeMap) ;
element = new HtmlHeading4 ( qualifiedName, page, attributeMap ) ;
element = new HtmlHeading2(qualifiedName, page, attributeMap); break; case HtmlHeading3.TAG_NAME: element = new HtmlHeading3(qualifiedName, page, attributeMap); break; case HtmlHeading4.TAG_NAME: <extra_id_0> break; case HtmlHeading5.TAG_NAME: element = new HtmlHeading5(qualifiedName, page, attributeMap); break; case HtmlHeading6.TAG_NAME: element = new HtmlHeading6(qualifiedName, page, attributeMap);