May want to add it to the documentation somewhere. Most places it mentions the “Title” behavior, and that it will truncate the post, and add a link — but does not mention it stripping MD/HTML.
It’s not mentioned here
Don’t let the name fool you. While Micro.blog is focused on short posts because we think it encourages people to write more often, you can just as easily publish long-form essays or posts with multiple paragraphs.
When you type over 300 characters on the web or in the official iOS, Android, and macOS apps, Micro.blog will automatically reveal a title field. Add a title if you wish, or leave it blank — it’s up to you. If you add a title, it will appear on the timeline, linked to your post when y…
Or here in the timeline display rules:https://book.micro.blog/microblog-and-feed/