<html>
  <head>
    <script>
      var oldHistoryObject = null;
      var bc = new BroadcastChannel("bug1155730_part1");
      bc.onmessage = (msgEvent) => {
        var msg = msgEvent.data;
        var command = msg.command;
        if (command == "test") {
          var currentCase = msg.currentCase;
          test(currentCase);
        }
      }

      function test(currentCase) {
        var assertIs = [];
        var assertOk = [];
        var assertIsNot = [];
        switch (currentCase) {
          case 1: {
            assertOk.push([history.scrollRestoration, "History object has scrollRestoration property."]);
            assertIs.push([history.scrollRestoration, "auto", "history.scrollRestoration's default value should be 'auto'."]);
            history.scrollRestoration = "foobar";
            assertIs.push([history.scrollRestoration, "auto", "Invalid enum value should not change the value of an attribute."]);
            history.scrollRestoration = "manual";
            assertIs.push([history.scrollRestoration, "manual", "Valid enum value should change the value of an attribute."]);
            history.scrollRestoration = "auto";
            assertIs.push([history.scrollRestoration, "auto", "Valid enum value should change the value of an attribute."]);
            bc.postMessage({command: "asserts", currentCase, assertIs, assertOk});
            document.getElementById("bottom").scrollIntoView();
            window.location.reload(false);
            break;
          }
          case 2: {
            assertIsNot.push([Math.round(window.scrollY), 0, "Should have restored scrolling."]);
            assertIs.push([history.scrollRestoration, "auto", "Should have the same scrollRestoration as before reload."]);
            history.scrollRestoration = "manual";
            bc.postMessage({command: "asserts", currentCase, assertIs, assertIsNot});
            window.location.reload(false);
            break;
          }
          case 3: {
            assertIs.push([window.scrollY, 0, "Should not have restored scrolling."]);
            assertIs.push([history.scrollRestoration, "manual", "Should have the same scrollRestoration as before reload."]);
            bc.postMessage({command: "asserts", currentCase, assertIs});
            bc.close();
            window.close();
            break;
          }
        }
      }
      window.onpageshow = (event) => {
        bc.postMessage({command: "pageshow", persisted: event.persisted});
      }
    </script>
  </head>
  <body>
  <div style="border: 1px solid black; height: 5000px;">
  &nbsp;</div>
  <div id="bottom">Hello world</div>
  <a href="#hash" name="hash">hash</a>
  </body>
</html>
