A stray character sits next to the menu icon: a plus, an arrow or a triangle that does not belong there.
It looks careless, right in the place every visitor looks first. Often it comes from a general style meant for something else.
Snaglist reads the ::before and ::after of the menu button and everything inside it, closed and open. Empty content, like the bars of a hamburger, and icon fonts do not count. A summary used as menu button that still shows its triangle is reported too.
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