Learn how checkbox and radio states can drive simple UI interactions in pure CSS, while understanding the accessibility and maintainability limits that tell you when JavaScript is the better tool.
Hidden checkbox, connected label and a `:checked` selector.
The `` activates its associated checkbox. CSS can then react through `:checked` and change the appearance of nearby elements.
The usual mechanism is a sibling combinator such as `+` or `~` to reach the panel you want to toggle.
Not every interactive state should be solved through a hack.
Avoid fragile selector chains that depend too heavily on the exact HTML order.
If the interaction needs Escape handling, focus management, outside-click closing or several synchronized states, JavaScript is usually the right layer.