code: function jsxTagName(tagName) {
    var name = tagName.toLowerCase();
  
    if (ELEMENT_TAG_NAME_MAPPING.hasOwnProperty(name)) {
      name = ELEMENT_TAG_NAME_MAPPING[name];
    }
  
    return name;
  }
docs: Convert tag name to tag name suitable for JSX.
  
  @param  {string} tagName  String of tag name
  @return {string}