UPDATE: I've learned that the markup language is BBCode. Still not sure what is and isn't supported, but that's a start.
I've searched the "help" and FAQ sections of MuseScore.com, and haven't been able to find any info on what markup tags are available for use in the website. It's easy enough to reverse-engineer the five tags offered in the regular editing interface (bold, italics, underline, quote, "@" mention), but I know, for example, that urls can be tagged with bracketed 'u' and 'url' tags, and I can't find information on the website that would have explained that to me.
Are there other tags beyond the 6 I'm aware of? And are they documented somewhere, or does the website use a common standard? It doesn't seem to be html or markdown, which are the only two that I have (limited) knowledge of.
|table cell 1||table cell 2|
|table cell 3||table cell 4|