code: def plotly_class(name=None, slug=None, da=None, prefix=None, postfix=None, template_type=None):
      'Return a string of space-separated class names'
  
      da, app = _locate_daapp(name, slug, da)
  
      return app.extra_html_properties(prefix=prefix,
                                       postfix=postfix,
                                       template_type=template_typef plotly_class(name=None, slug=None, da=None, prefix=None, postfix=None, template_type=None):
      'Return a string of space-separated class names'
  
      da, app = _locate_daapp(name, slug, da)
  
      return app.extra_html_properties(prefix=prefix,
                                       postfix=postfix,
                                       template_type=template_type)
docs: Return a string of space-separated class names