A text equivalent must be provided for all scripts. Adding the <noscript> element to documents that include scripts ensures the information will be available in a text format if the client's browser does not support scripts.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html lang="en"> <head> <title>aert1.0/1.1.10</title> </head> <body> <script><!-- do nothing --></script> </body> </html>
W3C WAI: http://www.w3.org/WAI//
HTML Techniques for WAI 1.0: http://www.w3.org/TR/WCAG10-HTML-TECHS/