Client side compatibility:
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* platform
Check for the responsibility of
a. Windows (95, 98, 2000 etc)
b. Unix (different sets)
c. Maintosh (if applicable)
d. Linux
e. Solaris
* Browsers
Check for various combinations
a. Internet explorer (3.x, 4.x, 5.x)
b. Netscape navigator (3.x, 4.x, 5.x)
c. AOL
d. Browser settings (security settings, graphics, java etc)
e. Frames and cascade style sheets
f. Applets, ActiveX controls, DHTML, Client side scripting, HTML specification.

 * Printing
Despite the paperless society the web was to introduce, printing is done more than ever considerations on.
a. Text and image alignment.
b. Colors of text, foreground and background
c. Scalability to fit paper size
d. Tables and borders.