HTML and CSS references
HTML
intro to html:
http://www.w3.org/MarkUp/Guide/Overview.html
http://htmldog.com/guides/htmlbeginner/
advanced html:
http://www.w3.org/MarkUp/Guide/Advanced.html
http://htmldog.com/guides/htmlintermediate/
http://htmldog.com/guides/htmladvanced/
reference:
http://htmldog.com/reference/htmltags/
full spec:
http://www.w3.org/TR/html4/
(HTML 4.01)
CSS
intro to css:
http://www.w3.org/Style/Examples/011/firstcss
http://www.w3.org/Style/LieBos2e/enter/
http://www.w3.org/MarkUp/Guide/Style.html
http://htmldog.com/guides/cssbeginner/
advanced css:
http://htmldog.com/guides/cssintermediate/
http://htmldog.com/guides/cssadvanced/
http://www.w3.org/Style/Examples/007/
reference:
http://htmldog.com/reference/cssproperties/
full spec:
http://www.w3.org/TR/css21/
(CSS 2.1)
mobile devices:
http://www.w3.org/TR/2008/REC-mobile-bp-20080729/
(mobile web best practices 1.0)
http://developer.apple.com/iphone/
(iphone sdk -- free download plus tutorials, videos and documentation)
http://code.google.com/android/
(android sdk -- free download, documentation, etc)