Hamburger menu is a navigation type that serves the purpose of hiding some menu items & showing them on click. While not recommended from a semantic point of view, you can also use a link with the href attribute (and a role="button"). Implementation help may be found at Stack Overflow (tagged bootstrap-4). ; Bootstrap scopes the :invalid and :valid styles to parent .was-validated class, usually applied to the
.Otherwise, any required field without a value shows up as invalid on page Datalists allow you to create a group of