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When designing and building the UI for an application that uses AJAX, when do you consider graceful degradation (for users who have JavaScript disabled, or are using a screen reader)?
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A system that continues to run at some reduced level of performance after one of its components fails. It is a level below fault-tolerant systems, which continue running at the same rate of speed. For example, a two-computer complex employing graceful degradation would be reduced to using one system if the other fails.
The purpose of graceful degradation is to prevent catastrophic failure. Ideally, even the simultaneous loss of multiple components does not cause downtime in a system with this feature. In graceful degradation, the operating efficiency or speed declines gradually as an increasing number of components fail.
The ability of maintaining functionality when portions of a system break down is referred to as graceful degradation. A fault-tolerant design enables a system to continue its intended operation, possibly at a reduced level, rather than failing completely, when some part of the system fails.
These days, progressive enhancement is generally preferred over graceful degradation - i.e. the exact opposite approach.
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The method I'm employing so far is to write it so it works without JavaScript and then add the JavaScript on top.
It's really the reverse of graceful degradation. It's an emphasis on enhancing the page as your browser and settings allow.
Relevant article
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