When webpack-dev-server is running with Automatic browser refresh the CSS will also update, but a bit differently. When you do a change to a CSS file the style tag belonging to that file will be updated with the new content... without a refresh!
当 Webpack-dev-server 在 浏览器自动刷新 下运行的时候，CSS 也会自动更新，不过有点不同的是，当你改变了一个 CSS 文件，属于那个文件的标签会更新新的内容但不会刷新。