docs: function initialCheck(attr_name) {
  
  	var elements = document.querySelectorAll('[' + attr_name + ']'),
  	    element,
  	    value,
  	    i,
  	    l;
  
  	for (i = 0; i < elements.length; i++) {
  		element = elements[i];
  		value = element.getAttribute(attr_name);
  
  		if (initial_seen.get(element)) {
  			continue;
  		}
  
  		if (attributes[attr_name]) {
  			initial_seen.set(element, true);
  			for (l = 0; l < attributes[attr_name].length; l++) {
  				attributes[attr_name][l](element, value, null, true);
  			}
  		}
  	}
  }