If you read the View Rendering section, it tells you about layouts.
This is a way to apply generic HTML wrappers to all of your pages.
For example Link
!!! 5 html head title Blog link(rel='stylesheet', href=base + '/style.css') body #container!= body
It is a layout for an example from the express folder. This will apply to all pages and your actual view that your rendering will display in != body
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