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Most HTML tags have browser inherited styles associated with them. These default styles are actually defined by the Web browser developer. Because the browser developer has added them, you need to remember that they are there and will affect your design. For example, the tag will italicize text on most browsers. No cosmic constant dictates that emphasized text is italicized; it’s just that the guys and gals programming the browser software decided to do it that way. The good news is that you can use CSS to override the browser styles.

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What Is SVG? The Scalable Vector Graphics (SVG) format is a method for creating vector graphics on the Web (see w3.org/ Graphics/SVG/). Like Flash, instead of plotting each point in a graphic, SVG data describes two points and then plots the path between them as a straight line or curve. Although it still lags behind Flash in browser penetration, SVG is natively supported in Firefox, Safari, and Chrome. The holdout is Microsoft’s Internet Explorer, which will not have SVG support until version 9.

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Working with Pseudo-classes Many HTML elements have special states or uses associated with them that can be styled independently. One prime example of this is the link tag which has link (its normal state), a visited state (when the visitor has already been to the page represented by the link), hover (when the visitor has their mouse over the link), and active (when the visitor clicks the link). All four of these states can be styled separately.

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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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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: