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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Elements can be classified according to the way they’re displayed—inline or block. By default, every tag has a display style that defines how it will fit with the surrounding tags. You can use the display property to define whether an element includes line breaks above and below (block), is included with other elements without hard line breaks (inline), is treated as part of a list (list), or is displayed at all (none). To set an element’s display type:
1. Start your declaration by typing the display property name in the CSS declaration block, followed by a colon (:) display:

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CSS level 2 (CSS2) The CSS2 spec came out in 1998 and is the most widely adopted by browser makers. Level 2 includes all the attributes of the previous two versions, plus an increased emphasis on international accessibility and the capability to specify media specific CSS. In 2006, the W3C published an updated version: CSS Level 2.1, which corrected some errors, clarified a few issues, and included specifications for features that had already been implemented in some browsers. CSS2.1 has effectively replaced CSS2.

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Setting the Table layout Different browsers use different methods to calculate how a particular table should be displayed. Two primary table-layout. Fixed method bases its layout on the width of the table and the width of columns in the first row. This method is generally faster than automatic. Automatic uses the table column width along with the amount of content in the table data cell to calculate the table data cell width. This will generally render more slowly than the fixed method, but it also produces more accurate results for widths throughout the table.

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CSS level 1 (CSS1) The W3C released the first official version of CSS in 1996. This early version included the core capabilities associated with CSS, such as the ability to format text, set fonts, and set margins. Netscape 4 and Internet Explorer 3 and 4 support Level 1. Web designers needed a way to position elements on the screen precisely. CSS1 was already released, and CSS Level 2 was still in the future, so the W3C released a stopgap solution: CSS-Positioning. This standard proposed that the parties concerned could debate for awhile before the CSS-P standard became official.

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Types of CSS Rules The best thing about cascading style sheets is that they are amazingly simple to set up. They don’t require plug-ins or fancy software—just text files with rules in them. A CSS rule defines what the HTML should look like and how it should behave in the browser window. CSS rules come in three types, each with specific uses: -HTML selector. The text portion of an HTML tag is called the selector. For example, h1 is the selector for the tag. The HTML selector is used in a CSS rule to redefine how the tag displays. -Class.