取消input表单轮廓线 outline鼠标选中输入框后的边框线

input输入框在鼠标选中时边框会变化 就是外边框outline

设置outline:0;或者outline:none;即可取消

DOCTYPE html>
<html lang="zn-cn">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Documenttitle>
    <style>
        input {
            width: 300px;
            height: 30px;
            outline: none;
        }
    style>
head>
<body>
    <input type="text">
body>
html>
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