Conditional fields not clearing upon submit

[Kyle Bayliss]

From @thibaudcolas:

This doesn’t seem to be working. Looking at the code, I think this is because the [hidden=true] selector won’t work, should be [hidden].

In addition,

• Clearing the value on submit and reset inputs won’t be very desirable. It seems unlikely for us to use either, but I’d still prefer we don’t remove their label
• I haven’t been able to test it but I don’t think clearing a radio or checkbox works like the code suggests - you’d need to find which input is checked, then .checked = false.
• For select – the node.type I get is select-one, and I think it would be better to set selectedIndex to 0.