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检查是否有行内样式

*[style] {    border: 3px solid red;    outline: 3px solid red;}

A标签里面的链接非法

a:not([href]),a[href="#"],a[href=""],a[href="javascript:void(0)"] {    border: 3px solid red;    outline: 3px solid red;}

img标签里没alt属性(不包括alt=”“)

img:not([alt]) {    border: 3px solid red;    outline: 3px solid red;}

缺少文档语言

html:not([lang]),html[lang=""] {    background-color: red;}

错误的编码标签(meta编码标签charset没设置成UTF-8)1

meta[charset]:not([charset="UTF-8"]) {}

文档编码格式没放head标签里面第一个位置

meta[charset="UTF-8"]:not(:first-child) {}

无法读取的视口属性

meta[name="viewport"][content="user-scalable=no"],meta[name="viewport"][content="maximum-scale"],meta[name="viewport"][content="minimum-scale"] {}

表单元素

input:not([id]),select:not([id]),textarea:not([id]) {    border: 3px solid red;    outline: 3px solid red;}input:not([name]),select:not([name]),textarea:not([name]) {    border: 3px solid red;    outline: 3px solid red;}label:not([for]) {    border: 3px solid red;    outline: 3px solid red;}form:not([name]):not([id]) {    border: 3px solid red;    outline: 3px solid red;}

空的交互式元素

button:empty,a:empty {    border: 3px solid red;    outline: 3px solid red;}

没有必要／废弃属性

script[type="text/javascript"],link[rel="stylesheet"][type="text/css"] {}