References
- ISO 8859-1 (Latin-1) Characters List with & Commands noted.
- Cascading Style Sheets 2
My primary reference for CSS; I validate my CSS code to meet this standard.
- GD.pm
On the fly Graphics generation routines for generating graphics in web pages.
- PHP reference
I have found PHP to be an excellent programming language for web applications.
- HTML 4.01 Reference
I am in the habit of validating to strict HTML 4.01 and use these pages frequently.
- html_standard
- javascriptdoc
- lastmod
- objects
- W3C MarkUp Validation Service
I validate all of the HTML and CSS that I write to these standards. I've found that valid code displays as closely alike among browsers as is possible. There's still the occasional bug to watch out for though.