<li> elements must be contained in a <ul> or <ol>
Moderatelistitem
What it checks
Ensure <li> elements are used semantically
How to fix it
Ensure <li> elements are direct children of <ul> or <ol>
WCAG
Success criteria 1.3.1. See the WCAG 2.2 quick reference.
More detail: Deque University's page on this rule.