REGRESSION (r269812): Amazon Prime: thumbnail fails to expand properly
Created attachment 415765 [details] Patch
<rdar://problem/71878636>
This is due to incorrectly running a CSS Transition for the `position` property.
Created attachment 415772 [details] Patch for landing
Committed r270589: <https://trac.webkit.org/changeset/270589> All reviewed patches have been landed. Closing bug and clearing flags on attachment 415772 [details].