<script>
      function printVar() {
          const origin = window.location.origin;
          document.write(`${origin}`);
      }
      printVar();
</script>

1. Get the full URL:                      window.location
2. Get the only protocol:                 window.location.protocol
3. Get the host (without port):           window.location.hostname
4. Get the host + port:                   window.location.host
5. Get the host and protocol:             window.location.origin

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