The 'mobile first' approach to web design dictates that you serve up some basic styles for simple devices, and build fancier styles on top of that with @media rules.
I'm not sure it's worth spending too much time worrying about the web on feature phones, though.
Certainly! But using them doesn't mean you can't cater for simpler devices too. As with all aspects of web design, progressive enhancement is the best approach. Serve all devices, and offer something better to those that can handle it.
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