The details and summary elements provide a native disclosure widget with accessible semantics. Use them for simple expand/collapse sections.
Tip: The open attribute controls the initial state and can be toggled by the user.
Custom Expand Widget(controlled with JavaScript)
This is a custom expand/collapse widget. The content is contained in a container with the class "details" and its visibility is toggled via JavaScript.
Accessible: aria-expanded on the button and region labeling.
Animated: smooth height transition for a polished feel.