​x
 
<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {
  background-color: lightblue;
  border: solid black 1px;
  block-size: 250px;
  writing-mode: vertical-rl;
}
</style>
</head>
<body>
​
<h1>block-size 属性</h1>
<p>在这里，block-size 属性会受到 CSS writing-mode 属性的影响。</p>
​
<div id="myDIV">
  <p>This is a DIV element.</p>
</div>
​
</body>
</html>
​