element-in-containing-block-chain-has-overflow-clip-with-padding-and-border
element-in-containing-block-chain-has-overflow-clip-without-padding-or-border
intersection-ratio-is-nonzero-but-is-intersecting-is-false
multiple-observers-with-different-roots-and-targets
no-intersection-when-root-is-not-in-containing-block-chain-of-target
observers-should-update-when-elements-move
previous-threshold-index-and-is-intersecting-fields-should-be-updated
root-has-nonzero-padding-and-border
root-has-nonzero-padding-and-border-and-overflow-clip
root-has-nonzero-root-margin
root-intersects-with-multiple-targets
root-is-viewport-and-target-is-partially-visible
target-has-nonzero-padding-and-border
target-with-nonzero-area-is-edge-adjacent-to-root
target-with-zero-area-is-edge-adjacent-to-root
unobserved-targets-do-not-get-included-in-next-update