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Chapter 1. Getting Oriented > Implementation of CSS in Browsers

Implementation of CSS in Browsers

Until quite recently, the main barrier to the acceptance of CSS on the World Wide Web by Web designers has been faulty and less than complete implementations of CSS in browsers. For instance, while Internet Explorer 5 for Windows supported about 70 percent of CSS1, Netscape Navigator 4, the next most popular browser, supported less than 30 percent of CSS1. The implementation of CSS in Netscape Navigator 4 is a particularly faulty one, as well. More recently, however, new versions of the most widely used browsers have been released that support most (at least 90 percent) of the CSS1 standard and parts of the CSS2 standard: Internet Explorer 5.5 for Windows, Internet Explorer 5 for the Macintosh, Netscape 6 (for Windows, Macintosh, and Linux), and Opera 5 (for Windows).

It may be helpful to think of these two groupings of browsers as comprising the first-generation and second-generation of CSS browsers, with a third-generation of CSS browsers still to come. First-generation CSS browsers only partially and imperfectly implement CSS1. Second-generation CSS browsers almost completely support CSS1 (at least 90 percent) and support parts of CSS2. Third-generation CSS browsers, such as Internet Explorer 6 and Netscape 7, for instance, will support all of CSS1 and most of CSS2, and so on.


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