How to detect if JavaScript is disabled?

Question

There was a post this morning asking about how many people disable JavaScript. Then I began to wonder what techniques might be used to determine if the user has it disabled.

Answer 1

Adding a refresh in meta inside noscript is not a good idea.

1. Because noscript tag is not XHTML compliant

2. The attribute value "Refresh" is nonstandard, and should not be used. "Refresh" takes the control of a page away from the user. Using "Refresh" will cause a failure in W3C's Web Content Accessibility Guidelines --- Reference http://www.w3schools.com/TAGS/att_meta_http_equiv.asp.