code: function getBaseUrl() {
    if (window.document.baseURI) {
      return window.document.baseURI;
    }
  
    // `document.baseURI` is available everywhere except IE
    if (!baseUrlParsingNode) {
      baseUrlParsingNode = window.document.createElement('a');
      baseUrlParsingNode.href = '.';
  
      // Work-around for IE bug described in Implementation Notes. The fix in `urlResolve()` is not
      // suitable here because we need to track changes to the base URL.
      baseUrlParsingNode = baseUrlParsingNode.cloneNode(false);
    }
    return baseUrlParsingNode.href;
  }
docs: Returns the current document base URL.
  @returns {string}