title: How to give tooltip to <th> element of table in HTML
body: <p>How to give tooltip to  element of table while hover the element.</p>
  
  <pre><code>&lt;th id="metricsHead"&gt;Grade_Desc&lt;/th&gt;
  </code></pre>
  
  <p>While hovering the element the tooltip should be "Grade Description"</p>