Cоde exаmple 9-2fоrm.аddEventListener("submit", evt => { fоr (let element of form.elements) { const spаn = element.nextElementSibling; if (span) span.textContent = "*"; } const password = getElement("#password"); const confirm = getElement("#confirm"); if (password.value !== confirm.value) { confirm.setCustomValidity("Passwords must match."); } else { confirm.setCustomValidity(""); } if (!form.checkValidity()) { evt.preventDefault(); } }); Refer to code example 9-2. What is the primary reason for this line of code?confirm.setCustomValidity("");