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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>585-element-deep display: block</title>
<script>
// Any copyright is dedicated to the Public Domain.
// http://creativecommons.org/publicdomain/zero/1.0/

function count() {
    var depth = 0;
    var deepest = 0;
    var current = document;
    var next = null;
    outer: for (;;) {
        if ((next = current.firstChild)) {
            depth++;
            if (depth > deepest) {
                deepest = depth;
            }
            current = next;
            continue;
        }
        for (;;) {
            if ((next = current.nextSibling)) {
                current = next;
                break;
            }
            current = current.parentNode;
            depth--;
            if (current == document) {
                break outer;
            }
        }
    }

    var h1 = document.getElementsByTagName("h1")[0];
    var p = document.createElement("p");
    var t = document.createTextNode("Actual depth (including text leaves): " + deepest);
    p.appendChild(t);
    h1.parentNode.insertBefore(p, h1.nextSibling);
}

function deep() {
    var t = document.createTextNode("PASS");
    var div = document.createElement("div");
    div.appendChild(t);
    for (var i = 0; i < 582; i++) {
        var another = document.createElement("div");
        another.appendChild(div);
        div = another;
    }
    document.body.appendChild(div);
    count();
}

window.addEventListener('DOMContentLoaded', deep, false);
</script>
</head>
<body>
<h1>585-element-deep display: block</h1>
</body>
</html>