<p>This test ensures that document.write after page load is synchronous.</p>

<p>You will get a PASS or FAIL alert message after a few seconds.</p>

<script>

window.onload = function() {

    // Build a very long string to write.

    var LIMIT = 17;

    var str = '<p style="display:none">x</p>';

    for (var i=0; i<LIMIT; ++i)

        str += str;

    // Write the string and check the DOM immediately and after a small delay.

    var doc = document.implementation.createHTMLDocument();

    doc.write(str);

    var immediateElementCount = doc.getElementsByTagName('*').length;

    setTimeout(function() {

        var delayedElementCount = doc.getElementsByTagName('*').length;

        var passOrFail = (immediateElementCount === delayedElementCount ? "PASS" : "FAIL");

        alert(passOrFail);

    }, 100);

}

</script>