Appendix D. Proprietary Tags
Although the vast majority of tags work for both major browsers, Netscape and Microsoft have developed sets of proprietary tags that work only in their respective browsers to gain an edge over the competition. Fortunately, this practice has come to an end (or at least slowed down) now that the browser companies have vowed to comply with standards, but we are still left with a legacy of tags that only work on one browser or another.
Dealing with browser differences is the major cause of headaches for web developers. The tables in this appendix list the available HTML tags that are still supported only in either Netscape Navigator or Internet Explorer.
D.1. Microsoft Internet Explorer Proprietary Tags
The following tags and attributes are supported only by Internet Explorer:
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