Idea: let `:::` pick its own HTML element about djot HOT 3 OPEN

Also, you're right that I don't want to make djot HTML-centric.

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This syntax is already fine; you can put a single word after ::: and it will be interpreted as a class.
https://djot.net/playground/syntax.html#div

Some small modifications to djot's HTML writer would allow Divs with the 'figure' class to render as figures. But I don't think it's something I'd want to make the default.

  local renderer = html.Renderer:new()
  renderer:div = function(node)
    if node.attr and node.attr.class == "figure" then
      self:render_tag("figure", node)
      self.out("\n")
      self:render_children(node)
      self.out("</figure>\n")
    else
      self:render_tag("div", node)
      self.out("\n")
      self:render_children(node)
      self.out("</div>\n")
    end
  end

That said, I think that having a dedicated syntax for figures would be a good thing. I'd like to avoid using English language keywords, though.

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For what it's worth, I interpret goal 11 as suggesting that there shouldn't be two ways to specify a class for a div, especially when the more explicit one is a single character longer.

Requiring ::: .foobar instead of ::: foobar would make this more consistent with other elements (as pointed out by @adiabatic) and would avoid the "magicness" of a bare word being interpreted as a class attribute (which, incidentally, is a HTML-centric default).

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