##<app-header-layout>
app-header-layout is a wrapper element that positions an app-header and other content. This
element uses the document scroll by default, but it can also define its own scrolling region.
Using the document scroll:
```html
App name
main content
```
Using an own scrolling region:
```html
App name
main content
```
Add the `fullbleed` attribute to app-header-layout to make it fit the size of its container:
```html
...
```