third_party/blink/web_tests/fast/dom/simultaneouslyRegsiteredTimerFireOrder.html

<p>
This page verifies that timers with equivalent fire times fire in the order they
were registered. If the test passes, you'll see a series of PASS messages below.
</p>

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

<script>
function log(s)
{
    document.getElementById("pre").appendChild(document.createTextNode(s + "\n"));
}

function shouldBe(a, aDescription, b)
{
    if (a === b) {
        log("PASS: " + aDescription + " should be " + b + " and is.");
    } else {
        log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
    }
}

var count = 100;
var firedTimers = [];

function fired(id)
{
    firedTimers.push(id);
    if (id == count - 1)
        done();
}

function done()
{
    for (var i = 0; i < count; ++i)
        shouldBe(firedTimers[i], "firedTimers[" + i + "]", i);

    if (window.testRunner)
        testRunner.notifyDone();
}

if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

for (var i = 0; i < count; ++i)
    setTimeout((function() { var j = i; return function() { fired(j); }})(), 0);
</script>