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How to use HTML Details Accordion Generator

Enter a title and content block for each item, and the tool builds native details/summary accordion markup, with the first item optionally open by default.

Frequently asked questions

Does the accordion need JavaScript?

No. The <details> and <summary> elements are natively interactive in all modern browsers, so clicking the summary expands and collapses the panel with zero JavaScript.

How do I make one section open by default?

Add the open attribute to a <details> element and it renders expanded on page load. The generator adds open to the first item when you enable that option.

Is a details accordion good for SEO and accessibility?

Yes. The content stays in the HTML so search engines can index it, and the native elements are keyboard accessible and announced correctly by screen readers.

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