Blocking Twitter Widgets from This Site
This post's featured URL for sharing metadata is https://www.jvt.me/img/profile.jpg.
However, Anna and Carol noticed that on Reader Mail: What Static Site Generator Would I Recommend? there were some issues with rendering the page, but I couldn't see it with my Firefox install.
It turns out that it was due to my various privacy-aware extensions that remove things like Twitter's widgets, so I never saw the issue on my own machines, but I had actually missed a couple of instances of the widgets on that post and one from a few years ago - woops!
I've since removed them, and to help prevent this issue in the future, I've decided to finally implement a check within my pipeline to enforce this using HTML-Proofer to ensure that I can flag up cases where I've accidentally added them and block the build if I push any posts that include the Twitter sharing widget, ensuring I can't push anything to production that includes these scripts!