<!DOCTYPE html>
<html>
<head>
<style>
body {
background-image: url("paper.gif");
background-repeat: repeat-y;
}
</style>
</head>
<body>
<h1>background-repeat 属性</h1>
<p>此处，背景图像仅在垂直方向上重复。</p>
</body>
</html>
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