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Legal StudiesCSS border-box 值
使用 CSS background-origin 属性设置border-box 值。使用 border-box 值时，背景图片始于边框的左上角。
你可以尝试运行以下代码以实现 border-box 值
示例
<!DOCTYPE html>
<html>
<head>
<style>
#value1 {
border: 3px solid blue;
padding: 30px;
background: url(https://tutorialspoint.com/assets/videotutorials/courses/html_online_training/380_course_216_image.jpg);
background-repeat: no-repeat;
background-origin: padding-box;
}
#value2 {
border: 3px solid orange;
padding: 30px;
background: url(https://tutorialspoint.com/assets/videotutorials/courses/html_online_training/380_course_216_image.jpg);
background-repeat: no-repeat;
background-origin: border-box;
}
#value3 {
border: 3px dashed yellow;
padding: 30px;
background: url(https://tutorialspoint.com/assets/videotutorials/courses/html_online_training/380_course_216_image.jpg);
background-repeat: no-repeat;
background-origin: content-box;
}
</style>
</head>
<body>
<h1>padding-box value</h1>
<div id = "value1">
<h2>Heading 2</h2>
<p>This is demo text. This is demo text. This is demo text. This is demo text. This is demo text. This is demo text. This is demo text. This is demo text. This is demo text.
<h3>Heading 3</h3>
This is demo text. This is demo text. This is demo text. This is demo text. This is demo text. This is demo text. This is demo text.</p>
</div>
<h1>border-box value</h1>
<div id = "value2">
<h2>Heading 2</h2>
<p>This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
<h3>Heading 3</h3>
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text.
</p>
</div>
<h1>content-box value</h1>
<div id = "value3">
<h2>Heading 2</h2>
<p>This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
<h3>Heading 3</h3>
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text.
</p>
</div>
</body>
</html>
更新时间： 2020-06-24
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