Let content.html be a html file containing the following html text:

<p>Some paragraph</p><p>Some other paragraph</p>

and consider this line of code:

  get("content.html",someHandler,"html");

If used on a web server, everything works fine. But if you test it locally, that is you open files from your filesystem in the browser, it gives the following error:

"Junk after document element"

which is because the content of content.html is being parsed as xml, despite the value "html" being passed as dataType to get().

Also, even without passing the "html" dataType parameter, the default "intelligent guess" (which works when served by the web server with mime type text/html) should work and guess it is html, since the file has a .html extension (the browser uses this criterion when deciding whether to parse a file as html or xhtml from the local filesystem), but it fails.

Strangely enough, despite the error (which is an error, not a warning) the rest seems to work; however the error shows that the loaded data is being parsed as XML instead of HTML which can eventually lead to problems.