file_anchor_ping.html

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<!DOCTYPE html>

<html lang="en">

  <head>

    <meta charset="utf-8">

    <title>file_anchor_ping.html</title>

  </head>

  <body onload="document.body.firstElementChild.click()">

    <a href="/">click me</a>

    <script>

      document.body.firstElementChild.ping = window.location.search.slice(1);

    </script>

  </body>

</html>