HTML Viewer yuuvis

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>HTML Viewer</title>
    <base href="/">
    <meta name="viewport" content="width=device-width, initial-scale=1" />
  </head>
  <body style="margin:0;">
    <iframe id="htmlViewer" style="width:100%;height:auto;outline:none;"></video>
    <script>
     window.addEventListener('load', function() {
          document.querySelector('#htmlViewer').setAttribute('src', decodeURIComponent(window.location.search.replace('?file=', '')));
      })
    </script>
  </body>
</html>