User blog comment:Kirkburn/Technical Update: July 18, 2016/@comment-25463305-20160718194624/@comment-126761-20160718201325

Essentially, yes - it has few restrictions, other than a height limit (which just makes it begin to scroll, rather than prevents the content being longer). We want admins to be able to provide a wide-range of useful suggestions and info for new (and existing) users with this section.