docs: function(constructing) {
  		if (gui.debug) {
  			var val, elm = this.element;
  			var fix = gui.attributes[0]; // by default using `gui`
  			if (constructing) {
  				if (gui.attributes.every(function(f) {
  					return !elm.hasAttribute(f);
  				})) {
  					val = "[" + this.constructor.$classname + "]";
  					elm.setAttribute(fix, val);
  				}
  			} else {
  				val = elm.getAttribute(fix);
  				if (val && val.startsWith("[")) {
  					elm.removeAttribute(fix);
  				}
  			}
  		}
  	}