<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test file</title>
<style>
body {
margin: 0;
}
.block {
height: 5000px;
}
</style>
<script>
window.test_result = 'test3_OK';
</script>
</head>
<body>
<a id="block1"></a>
<div class="block"></div>
<a id="block2"></a>
<div class="block"></div>
</body>
</html>