The http responses for web dynpro requests are typically XML documents. As a consequence the EEM Editor renders them as XML in the response browser, i.e., the actual HTML page is unreadable:
As work-around copy the data from the ”<div id” (beginning of CDATA section) up to the end of the document into a new document in your favorite text editor and save this document as file with suffix .html.
Then open this file in a browser you will be able to see the data: