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* use a [[Personal digital assistant|PDA]] or [[mobile phone]] browser which cannot execute JavaScript,
* have JavaScript execution disabled as a security precaution,
* use a speech browser due to, for example, a visual disability.
To support these users, web authors can try to create pages which [[Fault-tolerant system|degrade gracefully]] on user agents (browsers) which do not support the page's JavaScript. In particular, the page should remain usable albeit without the extra features that the JavaScript would have added. An alternative approach that many find preferable is to first author content using basic technologies that work in all browsers, then enhance the content for users that have JavaScript enabled. This is known as [[progressive enhancement]].
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