fails. It must be something related to the id-attribute because if I just use a, b, c as id, the code passes. I have looked up id limits and it cannot be a length issue, plus I'm starting with a character, so for me it's ok.
Question:
Why is the id attribute of the 4th radio button invalid, when the other three are working ok?
Thanks for enlightenment...
Solution
They're not the same, so your label doesn't refer to a form element...