Collapsible content panels using multiple CSS techniques
Using native HTML <details> and <summary> elements with CSS styling
The <details> element is a native HTML5 element that creates an interactive disclosure widget. The <summary> element provides the visible heading.
Advantages:
The <details> element has excellent built-in accessibility:
Yes! By default, multiple <details> elements can be open simultaneously. Each operates independently.
If you need single-open behavior (only one accordion open at a time), you'll need JavaScript to close other sections when one opens.
Excellent! The <details> element is supported in all modern browsers:
For older browsers, polyfills are available.
Using radio buttons to ensure only one section is open at a time
This accordion uses radio buttons, which means only one section can be open at a time. Clicking another section automatically closes the current one.
This pattern is useful for step-by-step processes, FAQs, or when you want to keep the interface compact.
The radio button is hidden with CSS, and the label acts as the clickable trigger. Since radio buttons are mutually exclusive by nature, only one can be selected at a time.
CSS uses the :checked pseudo-class to show/hide content and style the active section.
*Can be worked around by adding a hidden "none" radio option
Using checkboxes to allow multiple sections to be open simultaneously
Unlike radio buttons, checkboxes allow multiple sections to be open at the same time. Try opening several sections together!
This pattern is ideal for:
The checkbox hack uses the :checked pseudo-class combined with the sibling selector (~) to control content visibility.
input:checked ~ .content {
max-height: 500px;
padding: 20px;
}While this works well visually, consider these accessibility enhancements:
aria-expanded attribute (requires JS)<details> for better native supportStyled specifically for Frequently Asked Questions
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Since we can't directly animate height: auto, we use max-height as a workaround:
/* Collapsed state */
.content {
max-height: 0;
overflow: hidden;
transition: max-height 0.4s ease;
}
/* Expanded state */
input:checked ~ .content {
max-height: 500px; /* Set higher than expected content */
}Important: Set max-height larger than your content will ever be. The downside is that if the content is much smaller, the timing may feel off since it's animating the full max-height value.
For perfectly smooth animations regardless of content size, calculate the actual height with JavaScript:
element.style.maxHeight = element.scrollHeight + 'px';role="button" to labelsaria-expanded attribute (requires JS)aria-controls to link trigger to contentFor production use, start with <details> and <summary>, then enhance with JavaScript if you need features like:
* JavaScript needed only if you want single-open behavior
Use <details> and <summary> for 95% of use cases. It's native, accessible, and works beautifully with just CSS. Add minimal JavaScript only if you need specific behaviors like single-open mode or analytics.