Generate native details/summary accordion markup from title and content blocks, with an optional open-by-default first item. HTML Details Accordion Generator is a free online tool from the ToolsRift HTML Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
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.
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.
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.