code: function setClassName(element, cssClass) {
      cssClass = snippet.isArray(cssClass) ? cssClass.join(' ') : cssClass;
  
      cssClass = trim(cssClass);
  
      if (snippet.isUndefined(element.className.baseVal)) {
          element.className = cssClass;
  
          return;
      }
  
      element.className.baseVal = cssClass;
  }
docs: Set className value
  @param {(HTMLElement|SVGElement)} element - target element
  @param {(string|string[])} cssClass - class names
  @ignore