As found out in getpelican/pelican#2895, the generated code for nested, unordered lists fails the html-linter: "48:76: Error: General Formatting: Use a new line for every block, list, or table element ...

Description: This LI does not have a ul element (without an ARIA-assigned role); ol element (without an ARIA-assigned role); an element with a role set to the value: list as a parent; or a ul element ...