test_bug1850335.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>Test referrer with going back</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>

  <script>

    SimpleTest.waitForExplicitFinish();

    function waitForMessage(bc) {

      return new Promise(resolve => {

        bc.addEventListener("message", ({ data }) => { resolve(data); }, { once: true });

});

    async function runTest() {

      await SimpleTest.enableLegacyUnpartitionedStorage();

      let bc = new BroadcastChannel("bug1850335");

      // Load the first page.

      let waitForPage1 = waitForMessage(bc);

      window.open("file_bug1850335_1.html", "_blank", "noopener");

      let { persisted, value: initial } = await waitForPage1;

      ok(!persisted, "Loaded first page");

      is(initial, "", "Initial value is empty string");

      // Set the value of the input element in the first page.

      let waitForValue = waitForMessage(bc);

      bc.postMessage({ cmd: "setValue", arg: "ok" });

      let { value: expected }= await waitForValue;

      is(expected, "ok", "Loaded first page");

      // Load the second page (same origin with the first page).

      let waitForPage2 = waitForMessage(bc);

      bc.postMessage({ cmd: "load", arg: "file_bug1850335_2.html" });

      ({ persisted } = await waitForPage2);

      ok(!persisted, "Loaded second page (same-origin)");

      // Load the third page (cross origin with the first and second pages). The

      // third page will immediately do |history.back()| to go back to the

      // second page.

      waitForPage2 = waitForMessage(bc);

      const crossOrigin = new URL("file_bug1850335_3.html", `https://example.com${location.pathname}`);

      bc.postMessage({ cmd: "load", arg: crossOrigin.href });

      ({ persisted } = await waitForPage2);

      ok(!persisted, "Second page should not be in the BFCache");

      // Go back to the first page.

      waitForPage1 = waitForMessage(bc);

      bc.postMessage({ cmd: "back" });

      let { persisted: fromBFCache, value: result } = await waitForPage1;

      ok(fromBFCache, "Page came from BFCache");

      is(result, expected, "Value wasn't cleared");

      bc.postMessage({ cmd: "close" });

      bc.close();

      SimpleTest.finish();

  </script>

</head>

<body onload="runTest();">

<p id="display"></p>

<div id="content" style="display: none"></div>

<pre id="test"></pre>

</body>

</html>