same selector returns distinct NodeList objects: true
.item count after append: 1
.item count after second append: 2
.item count after remove: 1
.item count from document: 1
.item count after classList.remove: 0
.item count after classList.add: 1
#needle count after id set: 1
#needle count after id removed: 0
[data-k=v] count after setAttribute: 1
[data-k=v] count after attribute value change: 0
[data-k] count after removeAttribute: 0
:disabled count before: 0
:disabled count after: 1
FACE :enabled count before define: 0
FACE :enabled count after define: 1
FACE :disabled count before define: 0
FACE :disabled count after define: 1
:checked count before: 0
:checked count after: 1
:has(:checked) count after: 1
div:empty count before: 0
div:empty count after text.data = "": 1
div:empty count after text.data restored: 0
div:empty count after textContent = "": 1
i:nth-child(2) before reorder: two
i:nth-child(2) after reorder: one
:scope > .item count: 1
:scope > .item count after append: 2
disconnected .x count: 1
disconnected .x count after append: 2
shadow .s count: 1
shadow .s count after append: 2
traveler .y count: 1
traveler .y count after adopt roundtrip: 2
querySelector agrees with querySelectorAll[0]: true
querySelector after remove: true
repeated query returns distinct objects: true
repeated query returns identical non-empty results: true
querySelector agrees with repeated querySelectorAll[0]: true
repeated empty query stays empty: true