CSS @keyframe animations + `hidden="until-found"`
This is the contents of Accordion.Panel 1
It uses `hidden="until-found"` and can be opened by the browser's in-page search
This is the contents of Accordion.Panel 2
It uses `hidden="until-found"` and can be opened by the browser's in-page search
This is the contents of Accordion.Panel 3
It uses `hidden="until-found"` and can be opened by the browser's in-page search