P.S. The page at the indicated URL looks like a 404 error page and I don't see any invalid URL. Its <body> tag, as shown with Ctrl+U, has no attributes of any kind. If the webmaster in question "cleaned his/her act" at some point after comment #2, then any test performed after that were invalid.
I'm REOPENing the bug on that assumption. Someone, please provide an appropriate "badly constructed" HTML page, *not* anywhere on the web but as an *attachment* to this page. Then we can see if the Mozilla problem has really disappeared.
P.S. The page at the indicated URL looks like a 404 error page and I don't see any invalid URL. Its <body> tag, as shown with Ctrl+U, has no attributes of any kind. If the webmaster in question "cleaned his/her act" at some point after comment #2, then any test performed after that were invalid.
I'm REOPENing the bug on that assumption. Someone, please provide an appropriate "badly constructed" HTML page, *not* anywhere on the web but as an *attachment* to this page. Then we can see if the Mozilla problem has really disappeared.