title: Unique identifier for HTML elements
body: <p>Besides the ID, if you say you want a unique identifier for an HTML element (let’s say a div).</p>
  <p>I browsed the DOM for something (like a number or string) that was unique for each element; but the DOM was big and I failed to find that on the Internet.</p>
  <p>Is there a property (in the DOM obviously) that is unique only to that element? (Other than the ID and also you don't specify it, but it comes when the DOM is constructed.)</p>