Document Dom

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Page Title</title>
</head>
<body>

   <h1>Welcome To CloseTag.com</h1>
   <a name="Anchor1">Anchor 1 Content</a><br>
   <a name="Anchor1">Anchor 2 Content</a><br>
   <a name="Anchor1">Anchor 3 Content</a><br>
   <button type="button" id="button">Anchor Length</button>
   <h3 id="Result"></h3>
    <script>
    let button = document.getElementById('button');
    let len = document.anchors.length; 
    button.addEventListener("click",()=>{
    document.getElementById('Result').innerHTML = "<b>"+ len +"</b>";
    });
    </script>
  
</body>   
</html>