比如加了这种伪属性样式之后，在开发者工具查看的时候看不到伪属性

.userinfo-content::after{

content: " ";

display: inline-block;

height: 6px;

width: 6px;

border-width: 2px 2px 0 0;

border-color: #C8C8CD;

border-style: solid;

-webkit-transform: matrix(0.71, 0.71, -0.71, 0.71, 0, 0);

transform: matrix(0.71, 0.71, -0.71, 0.71, 0, 0);

position: relative;

top: -2px;

position: absolute;

top: 50%;

margin-top: -4px;

right: 15px;}