Broken list structure
list
A list contains items that are not list items, so software cannot announce how many entries it has.
Who this affects
Screen reader users, who normally hear "list of 7 items" before entering a list.
Fix it in WordPress
Often caused by a plugin injecting a div inside a menu. Check for menu-related plugins adding markup.
What the fix is, technically
Only li elements may be direct children of ul and ol.
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