<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>WAI_2_12_2</title> </head> <body> <!--the following elements should return errors--> <frameset> <frame src="frame1.htm" /> </frameset> <!--the following elemnets should be fine--> </body> </html>