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Shadydom seems to require a selector to the left of ::slotted.
https://github.com/webcomponents/shadycss#selector-scoping
Sortable-list is therefore currently not usable in apps that use Shadydom.
I added a selector left of ::slotted. This fixes the described error.
Tested on Chrome 61.0.3163.100, Firefox 56.0.2 and Safari 11.0.1