File: browser_sessionStorage.html

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>browser_sessionStorage.html</title>
  </head>
  <body>
    <iframe id="iframe"></iframe>

    <script type="text/javascript">
      let isOuter = window == window.top;
      let args = window.location.search.slice(1).split("&");
      let rand = args[0];

      if (isOuter) {
        let iframe = document.getElementById("iframe");
        let isSecure = args.indexOf("secure") > -1;
        let scheme = isSecure ? "https" : "http";
        // WARNING This iframe might not finish loading before the top level document does
        // See intermittent bug 1775609, bug 2001322
        iframe.setAttribute("src", scheme + "://example.com" + location.pathname + "?" + rand);
      }

      if (sessionStorage.length === 0) {
        sessionStorage.test = (isOuter ? "outer" : "inner") + "-value-" + rand;
        document.title = sessionStorage.test;
      }

      // Log the load so that it becomes more obvious if intermittent failures reoccur
      onload = () => {
        dump(`browser_sessionStorage.html ${isOuter ? 'TOP LEVEL' : 'IFRAME'} loaded\n`);
      }
    </script>
  </body>
</html>