Created attachment 274104 [details] Test case If you open the attached test case and scroll down, the black box should stick to the top left, and this is how it works in Firefox. In Safari, however, it does not stick. There is also a Stackoverflow post on this, http://stackoverflow.com/questions/28172079/safari-position-sticky-in-table-cell
This seems to be an issue with the selection of the containing block for calculating sticky constraints.
*** Bug 188992 has been marked as a duplicate of this bug. ***
Created attachment 436198 [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 436382 [details] Patch
Created attachment 437618 [details] Patch
Committed r282201 (241488@main): <https://commits.webkit.org/241488@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 437618 [details].
<rdar://problem/82914248>