<html>
<head>
    <script src="../../resources/js-test-pre.js"></script>
    <script>
        description('Tests that DOM timers on hidden pages that have not reached max nesting level are not throttled.');
        jsTestIsAsync = true;

        let timerCount = 0;
        let isPageVisible = true;
        const timeoutInterval = 10;
        let timerHandle = 0;
        const maxNestingLevel = 5;

        function testTimer()
        {
            timerCount++;

            timerHandle = setTimeout(testTimer, timeoutInterval);
            shouldBeFalse("internals.isTimerThrottled(timerHandle)");

            if (timerCount == 1) {
                testRunner.setPageVisibility("hidden");
                isPageVisible = false;
            } else if (timerCount == maxNestingLevel - 1) {
                testRunner.resetPageVisibility();
                clearTimeout(timerHandle);
                finishJSTest();
                return;
            }
        }

        function runTest()
        {
            if (!window.testRunner) {
                debug('This test requires testRunner');
                return;
            }
            testRunner.overridePreference("WebKitHiddenPageDOMTimerThrottlingEnabled", 1);

            timerHandle = setTimeout(testTimer, timeoutInterval);
            shouldBeFalse("internals.isTimerThrottled(timerHandle)");
        }
    </script>
</head>
<body onload="runTest()">
    <script src="../../resources/js-test-post.js"></script>
</body>
</html>