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