I know that the black list approach to css is dangerous, but there is someone that saw the alert on the page http://patapage.com/applications/pataPage/site/test

I know that the black list approach to css is dangerous, but there is someone that saw the alert on the page http://patapage.com/applications/pataPage/site/test/testSanitize.jsp http://patapage.com/applications/pataPage/site/test/testSani...? and if yes how?