Example Concept: ARIA roles and properties enhance the accessibility of custom form controls by defining their roles, states, and properties. For instance, using role="button" on a custom button element informs screen readers of its purpose. Additionally, ARIA attributes like aria-checked or aria-expanded communicate dynamic states, ensuring that users with disabilities can perceive and interact with the control as intended. It's important to use ARIA roles judiciously and only when native HTML elements cannot provide the necessary semantics.