I realized that if I type HTML comments in a post, such as:
<!-- [! [test-odp-lo1.png] (http://i.imgur.com/VOXJQhA.png)] (http://i.imgur.com/VOXJQhA.png) -->
… then the live Markdown preview shows them fine - but as soon as I post, the contents inside the comment tags are shown anyway, e.g. the same line above, inserted without preformatting, renders this:
I’m aware this isn’t exactly an advertised feature of Markdown on this site; but it can be quite useful (e.g. when you’re trying to change image links one by one in a post).
Would there be any other ways to use inline comments with LO postings?