Like all of the application chapters, this one has aged a great deal since 1999--at least, the browser part of it has. (The status of web servers is virtually unchanged.) With the exception of the final rows in Tables 2-1 and 2-3--which describe the level of PNG support in Netscape Navigator and Microsoft Internet Explorer, respectively, something that continues to be of particular interest to readers of this book--I have not updated the text in any way. However, the PNG web site is updated regularly and includes both a general summary of browser status and a complete list of PNG-supporting browsers:

http://www.libpng.org/pub/png/pngstatus.html#browsers
http://www.libpng.org/pub/png/pngapbr.html

It complements the more detailed and explanatory information presented in this chapter.