WeChat Mini Programs allow ES6 syntax. When using CSS3 there are some compatibility problems, you can't write this prefix. The tool comes with a small plug-in that can automatically complete it for us. When writing something that is CSS3 compatible, you don't need to write that prefix.
font-family: "Microsoft YaHei"; /* YaHei font */ background-color: #fff;
display: -webkit-flex; /* flex is actually in our H5, and there are some compatibility on the web side. Generally, we may add webkit in front of it */