Transitions are not possible when replacing the <body> element.
To transition the entire page, wrap it in a container element.
Following a link with animation
The link will load the fragment #story from the URL /page2.
Once the response is received, the old fragment version will fly out to the left, while the new
version will fly in from the right.
<a href="/page2"
up-target="#story"
up-transition="move-left">
Next page
</a>
Submitting a form with animation
The form will load the fragment .content from the URL /tasks.
Once the response is received, the old fragment version will fade out, while the new
version will fade in.
