双恒 CSS :focus 伪类的用法
您可以尝试运行以下代码来实现 :focus 伪类
示例
现场演示
<!DOCTYPE html>
<html>
<head>
<style>
input:focus {
background-color: orange;
}
</style>
</head>
<body>
<form action = >
Subject <input type = text name = subject><br>
Student: <input type = text name = student><br>
Age: <input type = number name = age><br>
<input type = submit value = Submit>
</form>
</body>
</html>输出
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