PVH / WWW-WebKit2-0.133 / t / test / events.html 
<!DOCTYPE html>
<html>
    <head>
        <title>events</title>
        <style>
        #big_content { border: 1px solid green; height: 2000px; }
        html, body { height: 100%; }
        </style>
        <script>
            window.onload = function() {
                var div = document.createElement('div');
                div.id = 'foobarbaz';

                window.setTimeout(function() {
                    document.body.appendChild(div);
                }, 500);

                window.setTimeout(function() {
                    document.body.removeChild(div);
                }, 1000);

                window.setTimeout(function() {
                    alert('hello there');
                }, 1500);

                var input = document.querySelector('input[name="focus"]');
                input.addEventListener('focus', function(e) {
                    alert('focused');
                });
                input.addEventListener('blur', function(e) {
                    alert('blurred');
                });
                document.querySelector('#start_ajax').addEventListener('click', function(e) {
                    let xhr = new XMLHttpRequest();
                    xhr.open('GET', window.ajax_url);
                    xhr.send();
                    xhr.onload = function() {
                        if (xhr.readyState === xhr.DONE && xhr.status === 200) {
                            window.setTimeout(function() {
                                document.querySelector('#ajax_result').innerHTML = 'Hello World';
                            }, 1000);
                        }
                    };
                });

                document.querySelector('#start_ajax_with_reload').addEventListener('click', function(e) {
                    let xhr = new XMLHttpRequest();
                    xhr.open('GET', window.ajax_url);
                    xhr.send();
                    xhr.onload = function() {
                        if (xhr.readyState === xhr.DONE && xhr.status === 200) {
                            window.setTimeout(function() {
                                console.log('reloading')
                                window.location.reload(true);
                            }, 1000);
                        }
                    };
                });

                document.cookie = 'foo=bar; path=/';
            }
        </script>
    </head>
    <body>
        <h1>Events Header</h1>

        <div id="big_content">
            <form>
                <input name="focus" value="1" />
            </form>
        </div>

        <button id="start_ajax">Start AJAX</button>
        <button id="start_ajax_with_reload">Start AJAX with page reload</button>
        <div id="ajax_result"></div>
    </body>
</html>