::fixture-ready::
$ grep -Rni --include='*.html' 'property="og:title"' public
public/blog/post.html:5:<meta property="og:title" content="Post One">
public/index.html:6:<meta property="og:title" content="Demo Site">
::exit-code::0
$ find public -name '*.html' -print | while read -r f; do grep -qi 'property="og:title"' "$f" || echo "$f"; done
public/about.html
public/draft.html
::exit-code::0