public static By tagName(final String tagName) {
    if (tagName == null)
      throw new IllegalArgumentException("Cannot find elements when tag name is null.");

    return new ByTagName(tagName);
  }
@param id The value of the "id" attribute to search for
@return a By which locates elements by the value of the "id" attribute.
selendroid-server/src/main/java/io/selendroid/server/model/By.java