https://codepen.io/etsisk/pen/dyZbgwq shows that `scroll-margin-top` doesn't work as expected.
<rdar://87983307>
Created attachment 450520 [details] Patch
This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess
Created attachment 450527 [details] Patch
Committed r288947 (246676@main): <https://commits.webkit.org/246676@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 450527 [details].