1.2 Normative References - superseded reference PNG

"1.2 Normative References reads in part:

• • • • • 
          W3C Recommendation, ""PNG (Portable Network Graphics) Specification"", 1 October 1996. http://www.w3.org/TR/REC-png-multi.html.

and is normatively cited at: 4.1.5 Icon: The image file SHOULD be a 16x16 PNG file, [as] defined in the PNG specification. (note the missing as)

That version of the PNG specification was superseded by:

• • • • • PNG
          Portable Network Graphics (PNG) Specification (Second Edition) , D. Duce, Editor, W3C Recommendation, 10 November 2003, http://www.w3.org/TR/2003/REC-PNG-20031110 . Latest version available at http://www.w3.org/TR/PNG .

(citation as reported by: http://www.w3.org/2002/01/tr-automation/tr-biblio-ui)"