The edit template body cascade is a cascade used by the default edit template to choose the template for displaying the tiddler body.

The core edit template body cascade can be found in $:/core/ui/EditTemplate/body

The default edit template body cascade consists of:

1. If the tiddler has the field _canonical_uri then use the template $:/core/ui/EditTemplate/body/canonical-uri to display the remote URL
2. Otherwise, use the template $:/core/ui/EditTemplate/body/default which provides the default editing interface

You can see the current settings for the view template body cascade in $:/ControlPanel under the Info -> Advanced -> Cascades -> Edit Template Body tab.