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HTML5 app development resource and advice site.  Same people who did the excellent CSS3 Please site.

CSS is a simple, declarative language for creating style sheets that specify the rendering of HTML and other structured documents. This specification is part of level 3 of CSS ("CSS3") and contains features to describe layouts at a high level, meant for tasks such as the positioning and alignment of "widgets" in a graphical user interface or the layout grid for a page or a window, in particular when the desired visual order is different from the order of the elements in the source document. Other CSS3 modules contain properties to specify fonts, colors, text alignment, list numbering, tables, etc.
The features in this module are described together for easier reading, but are usually not implemented as a group. CSS3 modules often depend on other modules or contain features for several media types. Implementers should look at the various "profiles" of CSS, which list consistent sets of features for each type of media.

After years of relative obscurity, the Web formatting standard called CSS, or Cascading Style Sheets has come into its own, taking a starring role as the mechanism for building a new generation of interactive, elaborate Web pages. CSS is growing in new directions now, and the technology's original creator believes its next direction for improvement will be dealing with more complicated Web page layout chores.
"There is important work left to be done for layout," Håkon Wium Lie, who is also Opera's chief technology officer, said in an interview here. The new CSS3 under development now can handle multi-column text arrangements, "but you couldn't replicate a printed newspaper in CSS."

Modernizr is a new library that detects various HTML5 and CSS3 features and lets you know so you can use them: Enables the writing of conditional CSS and conditional JavaScript! The JS tools just keep coming.