<!DOCTYPE html>
<html>

<head>
</head>

<body>
  <style>
    :root, body {
      margin: 0px;
    }

    #spacer {
      height: 100vh;
      width: 100px;
    }

    #top_box {
      width: 100px;
      height: 60vh;
      background-color: red;
    }
    #middle_box {
      width: 100px;
      height: 60vh;
      scroll-initial-target: nearest;
      background-color: purple;
    }
    #bottom_box {
      width: 100px;
      height: 60vh;
      background-color: yellow;
    }
  </style>
  <div id="top_box"><a id="anchor_target_link" href="#anchor_target">Anchor Link</a></div>
  <div id="middle_box"></div>
  <div id="bottom_box"></div>
  <div id="spacer"></div>
  <div id="anchor_target">Anchor Target</div>
</body>

</html>