A-Frame Course - Source of /examples/2000-ar-marker-01-simple.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />

    <script src="https://aframe.io/releases/1.2.0/aframe.min.js"></script>
    <script src="https://raw.githack.com/AR-js-org/AR.js/master/aframe/build/aframe-ar.js"></script>
  </head>

  <body >
    <a-scene embedded arjs="sourceType:webcam; detectionMode: mono_and_matrix; matrixCodeType: 3x3;">

      <a-assets>
        <img
          id="tron1"
          src="https://cdn.glitch.me/80978ab7-9db6-45ae-bc43-4fab16bdbb6e%2Fvlcsnap-2021-08-12-18h57m26s414.png?v=1633700386840"
        />        
      </a-assets>

      <a-entity camera></a-entity>

      <a-marker preset="kanji">
        <a-image src="#tron1" width="1" height="1" rotation="-90 0 0"></a-image>
      </a-marker>


    </a-scene>
  </body>
</html>