test_state_size.html

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<html>

<head>

  <meta charset="utf-8">

  <title>Test the max size of the data parameter of push/replaceState</title>

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

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

  <script>

    SimpleTest.waitForExplicitFinish();

    function test() {

      let tooLarge = SpecialPowers.getIntPref("browser.history.maxStateObjectSize");

      let allowed = Math.floor(tooLarge / 2);

      history.pushState(new Array(allowed).join("a"), "");

      ok(true, "Adding a state should succeed.");

      try {

        history.pushState(new Array(tooLarge).join("a"), "");

        ok(false, "Adding a too large state object should fail.");

      } catch(ex) {

        ok(true, "Adding a too large state object should fail.");

      SimpleTest.finish();

  </script>

</head>

<body onload="test()">

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

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

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

</body>

</html>