code: func (c ContentSpec) RenderBytes(ctx *RenderingContext) []byte {
  	switch ctx.PageFmt {
  	default:
  		return c.markdownRender(ctx)
  	case "markdown":
  		return c.markdownRender(ctx)
  	case "asciidoc":
  		return getAsciidocContent(ctx)
  	case "mmark":
  		return c.mmarkRender(ctx)
  	case "rst":
  		return getRstContent(ctx)
  	case "org":
  		return orgRender(ctx, c)
  	case "pandoc":
  		return getPandocContent(ctx)
  	}
  }
docs: // RenderBytes renders a []byte.