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68 CSS font stacks, media style sheets & web standards
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67 visibility drop down menu system
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206 This article demonstrates a DOM1 drop-down menu system using the CSS visibility property. Each menu has a main link and an unordered list of links that become visible, with the illusion of extending the main menu point downwards. The drop down menus are open source, accessible and forward compatible.
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209 The scripts and CSS for these drop down menus is provided under a Creative Commons License. 210
211215 Developing DHTML" that is fully backward- forward- and cross-compatible with all browsers has been a fundamental problem since client-side scripting was implemented in more than one Web browser. The DOM1 recommendation from the W3C defines a standard hierarchy of reference objects for HTML 4.01 and XHTML 1.0 documents that should at least make browser-safe forward-compatible scripting feasible. 216
217218 This demonstration page is assumed to be safe in all browsing circumstances; it will not cause Javascript errors, but is only intended to be fully supported by DOM1 enabled browsers. The scripting is not intended to work with the mutually incompatible, proprietary DOMs implemented by Netscape 4 and Internet Explorer 4 or earlier browsers; in these cases the browser just displays the main menu points statically. On the other hand, the code is guaranteed to be forward-compatible because it uses method, object and property checking to ensure that only DOM1 enabled browsers execute the relevant code. 219
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