code: function getHtmlElementString(dataSource, publicPath) {
    return Object.getOwnPropertyNames(dataSource)
      .map(function(name) {
        if (Array.isArray(dataSource[name])) {
          return dataSource[name].map(function(attrs) { return createTag(name, attrs, publicPath); } );
        } else {
          return [ createTag(name, dataSource[name], publicPath) ];
        }
      })
      .reduce(function(arr, curr) {
        return arr.concat(curr);
      }, [])
      .join('\n\t');
  }
docs: Returns a string representing all html elements defined in a data source.
  
  Example:
  
  const ds = {
  link: [
  { rel: "apple-touch-icon", sizes: "57x57", href: "/assets/icon/apple-icon-57x57.png" }
  ],
  meta: [
  { name: "msapplication-TileColor", content: "#00bcd4" }
  ]
  }
  
  getHeadTags(ds);
  // "<link rel="apple-touch-icon" sizes="57x57" href="/assets/icon/apple-icon-57x57.png">"
  "<meta name="msapplication-TileColor" content="#00bcd4">"
  
  @returns {string}