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browser CSS extensions In addition to supporting the specified CSS properties set by the W3C, a browser developer will occasionally introduce browser-specific properties. This is often done for one of two reasons: n A spec is still under development by the W3C but the browser developer wants to start using the style now. The browser developer wants to try a new idea but doesn't want to wait for the W3C to accept it and begin work on it, which can take years.

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Choose an organization scheme You should choose a consistent organization pattern and stick to it. I’m not going to tell you how to organize your style sheets—that depends on what works for you—but here are a few ideas to consider: Organize by selector type. Start with HTML selectors, then IDs, and then classes. Organize based on page structure. Group rules based on their parent tags. This works even better with HTML5 because page structure is stronger. The downside occurs when the same rules need to be applied at different places in the page.

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Rounded corners can help soften an otherwise sharp design, but they have been difficult to achieve using images. CSS3 includes a simple method for rounding off one or all of the corners of an element’s box: border-radius. Both Mozilla and Webkit have implemented their own versions of border-radius in advance of the final W3C pronouncement, and you need to take these browser extensions into account for the widest interoperability. To set rounded corners:

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The margin of an element allows you to set the space between that element and other elements in the window by specifying one to four values that correspond to all four sides together, the top/ bottom and left/right sides as pairs, or all four sides independently. To define the margins of an element: 1. Start your declaration by typing the margin shortcut property name in the declaration block, followed by a colon (:) margin: 2. Type a value for the margin.

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Colors create the first impression of your site. Bright, vibrant, jewel-like colors make a radically different statement than earth tones. Even if you choose to use only black and white, your design will make a statement. Beyond their decorative impact, colors can also guide the viewer’s eye around the page, helping to highlight some important areas while downplaying others. There are many methods used to add and control color with CSS. Keep in mind, however, you can specify color using several CSS properties. But, how to choose colors?.