HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>domain compare</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      "document.domain: " + document.domain + "\n" +
      "location.hostname: " + location.hostname + "\n" +
      "location.host: " + location.host + "\n" +
      "location.origin: " + location.origin;
  </script>
</body>
</html>

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domain vs hostname vs host vs origin (Try It)