Accordion behavior is discussed in the article in the "Accordions / Expanding Content Panels" section:

> Use the same name attribute on all related details (like radio buttons) to restrict only one open panel at a time

And tabs can be a <details>-based accordion with some creative CSS to adjust the layout (left as an exercise for the reader, but I could write up an example if that would be helpful!)

It won’t have the necessary keyboard shortcuts.