<!DOCTYPE html>
<html>
<head>
</head>
<script>
function setWindowRect(win, clientRect, fromWindow) {
if (win) {
var desktopLeft = fromWindow.screenLeft - fromWindow.screen.availLeft;
var desktopTop = fromWindow.screenTop - fromWindow.screen.availTop;
win.moveTo(clientRect.left + desktopLeft, clientRect.top + desktopTop);
win.resizeTo(clientRect.width, clientRect.height);
}
}
function createEqual(div, fromWindow) {
win = window.open("about:blank", "", "location=no, resizable=no, scrollbars=no, status=no, titlebar=no, toolbar=no, left=0, top=0, width=1, height=1");
win.document.write("<style>body { margin: 0 }</style><body></body>");
win.document.getElementsByTagName('body')[0].innerHTML = div.outerHTML;
setWindowRect(win, div.getClientRects()[0], fromWindow);
return win;
}
var window1;
var window2;
function runTests() {
var div1 = document.getElementsByTagName('div')[1];
var div2 = document.getElementsByTagName('div')[2];
window1 = createEqual(div1, window);
window2 = createEqual(div2, window);
window.onscroll = function() {
setWindowRect(window1, div1.getClientRects()[0], window);
setWindowRect(window2, div2.getClientRects()[0], window);
}
start = Date.now();
sign = 1;
function step(timestamp) {
var progress = timestamp - start;
var before = document.body.scrollTop;
window.scrollBy(0, 10 * sign);
if (before == document.body.scrollTop) {
sign = sign * -1;
}
requestAnimationFrame(step);
}
scrollTo(0, 0);
requestAnimationFrame(step);
}
function endTests() {
window1.close();
window2.close();
}
</script>
<body onload="runTests()" onunload="endTests()">
<div style="height: 1000px"></div>
<div style="background-color: red; width: 400px; height: 100px;"></div>
<br>
<div style="background-color: blue; width: 200px; height: 200px; float: right"></div>
<div style="height: 1000px"></div>
</body>
</html>