Three approaches: native details, button-controlled region, and a card-style toggle.
An expand/collapse widget reveals additional content on demand. Using the HTML <details> element provides built-in accessibility and keyboard support.
details[open].This region is controlled by the button above via aria-controls and aria-expanded. The content is hidden using the hidden attribute and revealed when the button is activated.
Keyboard and screen reader users receive state changes through ARIA attributes. You can customize the appearance and animations freely.
Tip: Use the Tab key to focus each toggle and press Enter or Space to activate.