index.html

<!DOCTYPE html>
<html>
  <head>
    <script src="https://aframe.io/releases/1.2.0/aframe.min.js"></script>
    <!-- include ar.js for A-Frame -->
    <script src="https://raw.githack.com/AR-js-org/AR.js/master/aframe/build/aframe-ar.js"></script>
  </head>
  <body style="margin: 0px; overflow: hidden">
    <a-scene embedded arjs>
      <!-- define your marker -->
        <a-marker type='pattern' url='tryAR_white_border.patt'>
      </a-marker>
      <a-entity camera></a-entity>

      <script>
        // Get a reference to the marker
        var marker = document.querySelector("a-marker");

        // Listen for the marker to be found
        marker.addEventListener("markerFound", function () {
          // Open a new window or tab
          window.open("https://tech.hirawat.in/", "_blank");
        });
      </script>
    </a-scene>
  </body>
</html>