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CSS Property Value - 如何font-size: 24pt;

font_size 【font_size】
我们想知道如何font-size: 24pt;
代码展示 运行结果 

<!DOCTYPE html>
<html lang="en">
<head>
<title>Example of absolute units</title>
<style type="text/css">
body {
  font-size: 12px;
}

h1 {
  width: 300px;
  font-size: 24pt;
  background-color: #ff00ff;
}

p {
  width: 20cm;
  font-size: 12pt;
  background-color: #fff000;
}
</style>
</head>
<body>
  <h1>This is a heading</h1>
  <p>This is a paragraph.</p>
</body>
</html>