What is HTML Details Accordion Generator?
The details and summary elements create native collapsible panels in HTML. The summary is always visible and acts as the toggle. When clicked, the rest of the details content expands. Multiple open details can be exclusive, which creates accordion behavior, with the name attribute. This works without any JavaScript.
Quick answer
Use the native HTML details and summary elements to create an accordion that works without JavaScript. Each details element is independent and can be opened or closed by the user.
Limitations
- Native details elements do not support closing one section automatically when another opens. That behavior requires custom JavaScript or the name attribute for exclusive accordion behavior.
- The open attribute controls whether the details element starts expanded. Only one boolean state is available -- there is no partial expand.
- Safari 17 and below do not support animating the details element open and close. Transitions require a CSS discrete transition polyfill.
How to use this tool
- Enter the items you want in the accordion as title|content pairs, one per line.
- Choose exclusive or multiple-open mode for the accordion behavior.
- The tool generates the details/summary HTML with CSS styling.
- Copy the markup and CSS into your page.
What you can use it for
- Build a FAQ accordion for a product or service page.
- Create collapsible documentation sections for a reference site.
- Add expandable content blocks to a blog post for long-form content.