您可以嘗試執行以下程式碼來實作:focus 偽類別
#現場示範
<!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>
以上是CSS :focus 偽類的用法的詳細內容。更多資訊請關注PHP中文網其他相關文章！
