| http://www.w3.org/ns/prov#value | - Obviously, this means that the field can???t be leftempty, but it also means that, depending on other attributes or the field???s type, onlycertain types of values will be accepted.If a required field is empty or invalid, the form will fail to submit, and focus willmove to the first invalid form element.The required attribute can be set on any input type except button, range, color,and hidden, all
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