List item

The element for one item of an ordered or unordered list — <li> inside <ul> or <ol>, and nowhere else — carrying its position in the list, its value in an ordered one, and any content at all: a line of text, a link, a card, a nested list

The unit a screen reader counts (“list, five items”) and reads by position, which is the whole reason to use a list rather than a run of <div>s. An <li> must be a direct child of a list element; a <li> in a <div> is invalid and loses the semantics. Nested lists go inside the <li> they belong to, not beside it. In this site’s sidebar each nav item is one, each entry in the feed’s month groups is one, and the agenda slide’s numbered rows are the <ol>’s <li>s with the numerals drawn by CSS.