<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 1px solid red;
margin-left: 100px;
}
p.ex1 {
margin-left: inherit;
</style>
</head>
<body>
<h1>使用继承值</h1>
<p>左外边距继承自父元素：</p>
<div>
<p class="ex1">本段落继承了 div 元素的左外边距。</p>
</div>
</body>
</html>