• Replace el.insertAdjacentHTML + parent.removeChild(el) with el.replaceWith.
• Add custom events to provide fragment access

This is to support our use cases for in-place refreshing of the same fragment. In those cases, the source will return another instance of include-fragment to be loaded on demand. We use these events to:

1. Obtain a reference of a focus target so we can restore focus after node replacement
2. Manipulate the fragment to restore element expand states prior to node replacement
3. Check if user is currently interacting with the element to prevent disruptive updates