This enables browsers and screen readers to identify related fields and provides accessibility and usability benefits, such as allowing users to submit with the ` Enter ` key and, on mobile, jumping from field to field within the form without having to close the on-screen keyboard. When a modal opens, the user's focus remains on the button that opened the modal, making it difficult for users to interact with the newly opened modal. It handles the initial focus, traps the focus so it cycles only through active elements within the modal, and can restore focus to the triggering element when the modal closes using its ` returnFocus ` option.