Yup.  More precise, it has the same specificity as the selector it is negating in its &quot;parameter&quot; (which must be a &quot;simple&quot; one, not compound).  My favourite CSS bruteforce hack [1] for boosting specificity exploits this:<p><pre><code>    *:not(#\0):not(#\0):not(#\0) {} &#x2F;* three ID strong anything *&#x2F;
</code></pre>
[1] Never used it in meaningful context, actually.