This is a testharness.js-based test.
FAIL Children of a slot in a document tree should not be counted in flattened assigned nodes. assert_array_equals: lengths differ, expected 1 got 0
FAIL Slot fallback content in shadow tree should be counted in flattened assigned nodes. assert_array_equals: lengths differ, expected 1 got 0
Harness: the test ran to completion.

