Compatibility

Least Common Denominator Design

• Cross-browser
• Cross platform
• Multiple resolution
• Do not depend upon third-party plugins, downloads or client-side programming

• Use Standards http://www.w3.org/TR/CSS21/ (but check cross-browser/cross-platform compatibility http://www.quirksmode.org/css/contents.html)
• Validate http://validator.w3.org/
• Third-Party Tools
• Test in real-life

Internet Trends

http://j-town.com/web_site_design/resources/stats.php

Israeli Sites are notorious for non-compatibility

Ben Gurion Airport
fails all tests - browser, platform and resolution
http://www.iaa.gov.il/Rashat/en-US/Airports/BenGurion/
http://www.iaa.gov.il/Rashat/he-IL/Rashot/BrowserSystemMessage.aspx

School site
http://efrjlm.go.cet.ac.il/go/index.asp

Photo gallery
http://www.israel4all.com/hebrew/
This site also uses frames
Why frames suck (1996)