Ensure that pages are accessible even when newer technologies are not supported or are turned off.
One common issue with the rate at which technology is changing is that new technology is most often made available before the masses are ready for it. One example would be digital television. Apparently, there is still a large enough number of people across the country who still use rabbit ears to pick up the television signal that the federal government has to step in and get these stragglers up to speed by providing them with digital converter boxes. This same type of issue exists on the internet as well.
When using new technologies, like style sheetes for example, it is proper design to make your pages viewable if style sheets are turned off or incompatible. By doing this, you increase the number of people who can access your site and also make it more usable for the technological slow-pokes.
Another good practice is to provide a second page that provide the same content as one that is using newer technologies. For example, a page the uses JavaScript should also have a second version that is accessible if JavaScript happens to be turned off or is unavailable.
One last example is to manually update dynamic content. In my opinion, this is a stretch. I would rather spend the time and effort to get users newer technology than go this far to allow them to continue to use outdated stuff. Not only would this be much easier, but it would benefit the user in the longrun and also help in the overall progression of web technology.
Good example of this guideline
-This is a good example because the drop-down menus still work with Java disabled.