CSS的作用：目标选择器
使用CSS：target选择器突出显示CSS的活动HTML锚点。
示例
您可以尝试运行以下代码来实现：target选择器
<!DOCTYPE html>
<html>
<head>
<style>
:target {
border: 2px solid #D4D4D4;
background-color: orange;
color: white;
}
</style>
</head>
<body>
<p>Click any of the subject below.</p>
<p><a href = "#tut1">Maths</a></p>
<p><a href = "#tut2">Java</a></p>
<p><a href = "#tut3">C++</a></p>
<p><a href = "#tut4">C</a></p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p id = "tut1"><b>Maths Tutorial</b></p>
<p id = "tut2"><b>Java Tutorial</b></p>
<p id = "tut3"><b>C++ Tutorial</b></p>
<p id = "tut4"><b>C Tutorial</b></p>
</body>
</html>