App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
div {
    font-size: 30px;
    border: 1px solid black;
}
span {
    font-size: 1ex;
}
</style>
</head>
<body>
<div>div 的 font-size 设置为 20px。 <span>div 中的 span 元素 font-size 为 1ex</span>。</div>
</body>
</html>
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