IE8 hangs on [removed] with “this command is not supported”

Question

For certain URLs (e. g. http://www.nyest.hu/iframe/240/10 ), IE8 (and older) never stops loading with the following error message: SCRIPT123: This command is not supported

Answer 1

Apparently this is because the page is served as XML, and there is no document.write in an XML document. Other browsers throw some sort of error at the document.write command too, but they handle the error better and do finish loading the page.