For example, in: <select id="example"><option disabled="disabled">Disabled option</option><option value="1">Value 1</option></select> The "Disabled option" will be selectable.
Created attachment 8395 [details] An example of a selectable, disabled, option.
This bug has been already fixed in nightly builds, <http://nightly.webkit.org>. *** This bug has been marked as a duplicate of 4340 ***