Why are my input radio elements greyed out?

Question

I've got three radio input elements:

<input type="radio" id="visitor" />Visitor
<input type="radio" id="ucstudent" />UC Student
<input type="radio" id="ucemployee" />UC Employee

They are all greyed out (the radio button itself as well as the text). Why? Nothing else on my form is (greyed out).

My .css file does nothing with type="radio", id="visitor", id="ucstudent", or id="ucemployee".

Answer 1

Add the name attribute to the inputs:

<input type="radio" id="visitor" name="type" />Visitor
<input type="radio" id="ucstudent" name="type" />UC Student
<input type="radio" id="ucemployee" name="type" />UC Employee