<html>
<head>
<style>
a[target] {
background-color: yellow;
}
div {
border: 1px solid black;
}
</style>
</head>
<body>
<p> CSS 选择器 a[target] 确保所有带有 target 属性的背景色设置为黄色：</p>
<div id="myDIV">
Three links inside div:
<a href="/">ziqiangxuetang.com</a>
<a href="http://www.disney.com" target="_blank">disney.com</a>
<a href="http://www.wikipedia.org" target="_top">wikipedia.org</a>
</div>
<p>点击按钮为 div 元素中带有 target 属性的第一个属性设置红色边框。</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var x = document.getElementById("myDIV");
x.querySelector("a[target]").style.border = "10px solid red";
}
</script>
</body>
</html>