Web

"Users spend most of their time on other websites." — Jakob Nielsen

Standards

"I think there's a fundamental difference in mental model between the standards crowd and the dee-zyner crowd: the former think that when the viewer browses their work, they, the authors, are guests in the viewer's space; the latter think that the viewer is a guest in the author's space." — Eric Bohlman

RFC

• Official Internet Protocol Standards
• Internet Protocol (IP)
• User Datagram Protocol (UDP)
• Transmission Control Protocol (TCP)
• TELNET Protocol Port 23
• File Transfer Protocol (FTP) Port 21
• Simple Mail Transfer Protocol (SMTP) Port 25
• Post Office Protocol - Version 3 (POP3) Port 110
• A Standard for the Transmission of IP Datagrams on Avian Carriers
• Uniform Resource Identifiers/Locators (URIs/URLs)
• Hypertext Transfer Protocol (HTTP) Port 80

W3C

• HTML Validator
• Link Checker
• CSS Validator

Miscellaneous

• HTTP Viewer
• Multipurpose Internet Mail Extensions (MIME) Media Types
• Unicode and Character Sets
• Prefixes for Binary Multiples
• International Standard Paper Sizes
• Display Standards