As David Lively commented, find "unobtrusive javascript" as well as "progressive improvement." Ignore old articles of "graceful degradation."
If you start by creating a web 2.0 page, try gracefully pulling back if there is no javascript, it will be much more difficult for you than if you start with a simple page that works for everyone, and then increase it by using javascript when it is available .
It can be done (it’s true, I swear I did it), regardless of what some people think. It is more than zero, but it does not do everything twice.
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