标签：text img lin out ima doctype es2017 logs http
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
input:focus{
outline: red 1px solid;
}
</style>
<title>outline</title>
</head>
<body>
<input type="text">
</body>
</html>
当input框获取焦点时，边框变红
标签：text img lin out ima doctype es2017 logs http
原文地址：http://www.cnblogs.com/ronghtp/p/7647329.html
