Just ensure content frag from _contentForTemplate is inert. Edge does not seem to always use the exact same owner document for templates.
Just ensure content frag from _contentForTemplate is inert.
Edge does not seem to always use the exact same owner document for templates.

ikeagold/polymer,JeremybellEU/polymer,ikeagold/polymer,JeremybellEU/polymer,ikeagold/polymer,JeremybellEU/polymer,Polymer/polymer,Polymer/polymer,Polymer/polymer