Please open file "vendor\magento\module-catalog\view\adminhtml\templates\catalog\product\attribute\js.phtml".

Go to the function updateRequriedOptions(Line Number 258)

 function updateRequriedOptions()
    if ($F('frontend_input')=='select' && $F('is_required')==1) {
    } else {

Please, what is $F here?


According to prototype documentation


Returns the value of a form control. This is a convenience alias of Form.Element.getValue

Check Documentation

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