By accident, this page seems to either contain or link to a lot of pages about best practices for web fonts--refer to this (if I ever find use for them)

API for future offline relational data storage.

A test of the portability of embedded images in HTML email across different popular (web) email clients. Note in particular the suggestion by Arjen van Reeven in the comments.

It's possible to do a lot more than just select by class, element or id. But consult with quirksmode; browser support is sketchy at times.

" ... CSS 3 introduces a number of new features that significantly reduce the amount of work required to get desirable UI stylings, rounded corners being one of them. Not all browsers implement these features, and some have their own vendor-specific prefix as the support for the feature may not be considered complete or to the published spec ... "

Why you shouldn't parse html with regexes. Pure, unadulterated genius.

" ... According to the W3C, when you’re evaluating your web site for accessibility, you should ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits or when viewed on a black and white screen. How does one know if two colors will provide sufficient contrast? Well, the W3C, being the fastidious folks that they are, provide the following definition and formulas to make what seems subjective very quantifiable ... "