The document <cite>[Understanding Success Criterion 1.3.6: Identify Purpose](https://w3c.github.io/wcag/understanding/identify-purpose.html)</cite> lists the following advisory technique: > Using `aria-invalid` and `aria-required` These two attributes typically relate to user input. This advisory technique should be moved to the document <cite>[Understanding Success Criterion 1.3.5: Identify Input Purpose](https://w3c.github.io/wcag/understanding/identify-input-purpose.html)</cite>, since it's specifically for inputs.