[media type] xml-stylesheet PI only [text/html] recognized as HTML, xml-stylesheet PI was not recognized [text/xml] recognized as XHTML, but the type selector in style sheets matched case-insensitively [application/xml] recognized as XHTML, but the type selector in style sheets matched case-insensitively [application/xhtml+xml] 
recognized as XHTML, but the type selector in style sheets matched case-insensitively