<!DOCTYPE html>
<html>
<head>
<style>
.fixed {
position: fixed;
width: 10px;
height: 10px;
}
</style>
</head>
<body onload="window.scrollTo(300, 600)">
<div style="width: 1500px; height: 1500px"></div>
<!-- When the size of the frame is 800x600, the first 3 divs are out-of-view and should not be composited, and the last 2 divs should be composited. -->
<div class="fixed" style="top: -100px"></div>
<div class="fixed"></div>
<div class="fixed" style="top: 0px; left: 1000px"></div>
<div class="fixed" style="top: 0px; left: 600px"></div>
<div class="fixed" style="top: 0px; left: 0px"></div>
</body>
</html>