A form field should be labelled. Use a label element with a ‘‘for’’, ‘‘aria-label’’ or ‘‘aria-labelledby’’ attribute according to specifications.
Engine scans page for form fields, except buttons, and validates if they have a <label for=”input_id”>, <aria-label=”value”>, <aria-labelledby= id=”input_id”> or <title=”value”>.
Some users will not be able to identify the purpose of the form control.