code: function beforeElementClose(input, element, content) {
              // Sanity check
              verifyParameterIsDefined(input, 'input', beforeElementClose.name);
              verifyParameterIsDefined(element, 'element', beforeElementClose.name);
  
              return insertBefore(normalizeValue(input), normalizeRegExp(`<\/${normalizeValue(element)}[^\>]*>`), normalizeValue(content));
          }
docs: Inserts content into the input string before the first occurrence of the element close tag.
  
  @param {String|Function} input the input to replace
  @param {String|Function} element the element to insert before close
  @param {String|Function} content the content to replace within the input string
  @return {String} a String which has the content added before the first occurrence of the element close tag within the input string
  @throws {String} when input or element are not defined