Since these tags were developed by Netscape, other browsers don't support them, at least for now. If you use the new tags, keep in mind that a portion of your audience won't be able to view all parts of your pages. Netscape has pledged to support the HTML 3.2 specification from the World Wide Web Consortium once it's been finalized. Availability and Support Navigator 3.0 is free to students, faculty, and staff at educational institutions. At MIT, you can download the Navigator 3.0 installer package from the IS server, net-dist.mit.edu.
Navigator comes with online release notes and a handbook.