protocolHandler.html

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<!DOCTYPE html>

<html>

  <head>

    <title>Protocol handler</title>

    <meta content="text/html;charset=utf-8" http-equiv="Content-Type">

    <meta content="utf-8" http-equiv="encoding">

  </head>

  <body>

    <script type="text/javascript">

      navigator.registerProtocolHandler("web+testprotocol",

          "https://example.com/foobar?uri=%s",

          "Test Protocol");

    </script>

    <a id="link" href="web+testprotocol:test">testprotocol link</a>

  </body>

</html>