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Appendix A. The DHTML and CSS Browsers

Appendix A. The DHTML and CSS Browsers

For a browser to be considered DHTML- and CSS-capable, it must support the following technologies to some degree:

  • HTML. HTML is the foundation of all DHTML. Support of the recent HTML 4 (currently at Version 4.01) standard is preferred.

  • JavaScript. If HTML is the foundation, JavaScript is the cornerstone of DHTML.

  • CSS Level 1. CSS provides much-needed style controls for Web layout, as well as the capability to define elements as objects on the screen.

  • CSS Positioning or CSS Level 2. To move and change objects, the browser must support the positioning controls in either the early CSS-P standard—which was later integrated into CSS2—or CSS2.

  • DOM. The browser must use some form of the Document Object Model. The standard version of the World Wide Web Consortium (W3C) is preferred (see "The W3C ID DOM" in Chapter 11).

The browsers discussed in this appendix meet (or will meet) these criteria.

Non-DHTML Browsers

Some browsers in use today do not run DHTML code, especially with the increase of Web access by hand-held devices. If you do not want to turn off a significant portion of your potential audience, your Web pages should work both with and without DHTML. It's a good idea to test your Web pages in as many Web browsers as possible before going live on the Web.



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