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    <p>This question comes up a couple times per week here, and you have enough rep you should know that. Did you search?</p> <p>Anyway, the thing here is that there are a lot more users on the public internet who may have trouble with javascript than you think:</p> <ul> <li>Mobile browsers (smartphones) often have very poor or buggy javascript implementations. These will often show up in statistics on the side of those that <em>do</em> support javascript, even though they in effect don't.</li> <li>Things like NoScript are becoming more popular, so you should at least have a nice initial page for those users.</li> <li>If your customer is in any way part of the U.S. Goverment, you are legally required to support screen readers, which typically don't do javascript.</li> <li><strong>Google</strong> and other search engines won't run your scripts when indexing the site. You need to work well enough without javascript to allow for that.</li> </ul> <p>Of course, you need to know your audience. You might be doing work for a corporate intranet where you <em>know</em> that <em>everyone</em> has javascript (though even here I'd argue that there's a growing trend where these sites are made available to teleworkers with unknown/unrestricted browsers), or you might be building an app for the blind community where <em>no one</em> has it. In the case of the public internet, you can typically figure that about 95% of your users will support it in some fashion (source cited by someone else in one of the links below). But that number isn't as high as it sounds. Turn it around, and if you don't support javascript you're turning away one visitor for every 20.</p> <p>See these: </p> <ul> <li><a href="https://stackoverflow.com/questions/121108/how-many-people-disable-javascript">https://stackoverflow.com/questions/121108/how-many-people-disable-javascript</a></li> <li><a href="https://stackoverflow.com/questions/822872/do-web-sites-really-need-to-cater-for-browsers-that-dont-have-javascript-enabled">Do web sites really need to cater for browsers that don&#39;t have Javascript enabled?</a>></li> </ul>
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    1. POShould your website work without JavaScript
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    1. COI think I read that the Google spider actually does run javascript, but I can't find the link at the moment.
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    2. COI believe it only runs trivial things like document.write()
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