1. Deprecated("Internal Use Only")
dynamic getHtmlCreateFunction(String key)

Source 

@Deprecated("Internal Use Only")
getHtmlCreateFunction(String key) {
  var result;

  // TODO(vsm): Add Cross Frame and JS types here as well.

  // Check the html library.
  result = _getHtmlFunction(key);
  if (result != null) {
    return result;
  }

  // Check the web gl library.
  result = _getWebGlFunction(key);
  if (result != null) {
    return result;
  }

  // Check the indexed db library.
  result = _getIndexDbFunction(key);
  if (result != null) {
    return result;
  }

  // Check the web audio library.
  result = _getWebAudioFunction(key);
  if (result != null) {
    return result;
  }

  // Check the web sql library.
  result = _getWebSqlFunction(key);
  if (result != null) {
    return result;
  }

  // Check the svg library.
  result = _getSvgFunction(key);
  if (result != null) {
    return result;
  }

  return null;
}