"In the case of a block element that has a specified width, left and right margins to which a value of auto is applied will be set to be equal. This will effectively center the element in the available space."

"User CSS is a Safari 5 extension that will easily enable you to override stylesheets for any web page for anything—from changing fonts, colors to hiding ads and more!"

"The foundational CSS Fonts provides cross-browser typographical normalization and control while still allowing users to choose and adjust their font size. Both Standards and Quirks modes are supported in A-grade browsers."

"CSS Base is an optional CSS file that complements YUI's core CSS foundation (CSS Reset and CSS Fonts). CSS Base applies a style foundation for HTML elements that is consistent for A-grade browsers. CSS Base may also be useful as a template for your own base file, or a snippets library for styling HTML elements."

"The foundational CSS Reset removes the inconsistent styling of HTML elements provided by browsers. This creates a dependably flat foundation to built upon. With CSS Reset loaded, write explicit CSS your project needs."

"The YUI Compressor is written in Java (requires Java >= 1.4) and relies on Rhino to tokenize the source JavaScript file."

"YUI 3 is Yahoo!'s next-generation JavaScript and CSS library. It powers the new Yahoo! homepage and incorporates what we've learned in five years of dedicated library development. As of the 3.1.0 release, the YUI 3 Library has grown to include the core components, a full suite of utilities, the Widget Infrastructure, and a few Widgets."

"PHP provides an alternative compression method (two actually) and this is exactly what we'll leverage here - so one could think of this method as a 'poor man's mod_gzip'."

"Open up your style.css.php, or whatever you named it, file and add the following snippet of PHP to the very top: <?php if(extension_loaded('zlib')){ob_start('ob_gzhandler');} header("Content-type: text/css"); ?>

Then, add the next line to the very bottom and save the file: <?php if(extension_loaded('zlib')){ob_end_flush();}?>"

"Again: the property line-height can accept unitless number values, and they’re a better choice than united values in 99 out of 100 cases anyway. Okay? Thank you."

Great choice.

"I’m currently working on a design that uses text-shadow and box-shadow, with RGBA in place to create the shadow color. I wanted to tweet about this technique because it’s simple and awesome, but to my surprise I couldn’t find a good, quick tutorial that covered the use of both text and box-shadow, along with RGBA. So I decided to create one."

RE: body {font-size: 62.5%;}

"If you’re looking for neat examples of CSS3 effects that happen on hover, multiple background images, forms that use CSS3, killer CSS3 buttons, or scale and rotate transforms, then here’s a few sites that may inspire you:"

"Recently, thanks in large part to the influence of design hero Dan Cederholm, I’ve come to the conclusion that a website’s design should begin where it’s going to live: in the browser."