What's the “for” for in a label tag?

Question

Just ran across a for parameter in an HTML label tag:

 First Name 
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Answer 1

It specifies to which element that label is bound to. In your sample code the label is there for the required-firstname input field. If the user clicks on that label, the focus will go to the bound input field. It's a usability improvement and I think you'd be better off leaving it as is. It's a good practice.