leftover og

 leftover og  is an example of the downsides of the invisible metadata antipattern, and what happens when you update a page or copy paste a template and don’t realize you’ve kept or propagated obsolete or inapplicable OGP meta tags because they’re not visible when you view the page you’ve created; this error has happened with IndieWebCamp event pages as recently as 2018.indieweb.org.