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<!DOCTYPE html>
<title>CSS Reference</title>
<style>
.container {
width: 100px;
height: 70px;
}
.strip {
width: 100px;
height: 10px;
background-color: green;
}
.gap {
width: 100px;
height: 50px;
}
</style>
<p>Test passes if there are two green horizontal strips below, separated by a 50px gap, with no extra empty area.</p>
<div class="container">
<div class="strip"></div>
<div class="gap"></div>
<div class="strip"></div>
</div>