After Hugo version 0.60 Goldmark became the default formatter instead of Blackfriday. The biggest breaking change is that now having inline HTML in Markdown is considered “unsafe” and disabled by default.
If you are, like me, into adding some visual decorations via CSS, this might come as a big surprise when all your custom visual elements stop showing.
Instead of this:
[markup]
[markup.goldmark]
[markup.goldmark.renderer]
unsafe = true