Trigger. A native button from Collapsible, named by its visible label, with aria-expanded and, while the items are mounted, aria-controls. The search glyph and the chevron are aria-hidden.
Items. A list of list items. A file chip is text in the reading order of its item: the item's text, then the file names.
Motion. The open and close fades remain under reduced motion; the height and chevron changes are immediate.
Reflow. Chips wrap to the next line, and a long or unbroken text or file name wraps inside the row.
Forced colors. Token chips keep their edge in system colors, and the focus ring uses system colors.