Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
结合规范来看，个人理解为：
ea6d742c-fb7d-4da2-b802-a23fdb5ca147-image.png
