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does somebody exactly know what informations firefox sends to tell the application that javascript is disabled? I´ll need this for automation purpose: I have to imitate a browser with js disabled.

Alex Guth
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    I don't think it is sending any information at all. All "JS disabled" detection tricks I know use workarounds to detect its absence... where do you get the idea from that information is sent? – Pekka Dec 16 '12 at 12:59
  • I´m not that familiar with js. I just realized that some websites see the cURL client as a client with javascript ENabled. I thought, there would be something sent to check the js support. But Pekka seems to be right: There are just a few workarounds, so to imitate a browser with no js support i have to go deeper into code and find out, which workaround is used there. – Alex Guth Dec 16 '12 at 13:07
  • If you want to see what happens when visit a site use fiddler. – Bakudan Dec 16 '12 at 13:07
  • This may not be the most advanced question, but I don't see why it deserves 3 downvotes? – Pekka Dec 16 '12 at 13:08
  • Somewhat related, but not the same: [How to detect if JavaScript is disabled?](http://stackoverflow.com/questions/121203/how-to-detect-if-javascript-is-disabled) – hakre Dec 16 '12 at 14:18

1 Answers1

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If a browser has JavaScript disabled, it:

  1. Will not process JavaScript script elements (won't execute the code within them if they're inline, won't download or execute the referenced files if they use src).

  2. Will render the markup contents within <noscript>...</noscript> blocks in the document's markup.

  3. Will not fire any event handlers hooked up with DOM0 attributes like onclick and such.

I don't believe there's any information sent to the server to tell it the browser has JavaScript disabled, e.g., there's no difference in the accepts header or similar.

T.J. Crowder
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    In addition: won't fire any JavaScript events and thus won't call any JavaScript event listeners when used in `onEVENT` attributes. – Zeta Dec 16 '12 at 13:03