[css-view-transitions-2][scoped] Allow starting a scoped view transition on a shadow root #12953
Description
Currently transitions can only be started on an element/document.
Starting a transition on the element as the scope, would only include same-tree descendants of that element when finding participants.
Considering adding shadowRoot.startViewTransition, which would pick elements and create pseudo elements inside the shadow scope.
How does this work with Shadow DOM? If I'm manipulating multiple elements that are directly the children of a shadow root, what do I call
startViewTransition()on?
Originally posted by @EisenbergEffect in #9890