🖍 Restrict page attachment sticky header to non-iOS, non-Safari surfaces #36133
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The sticky positioning of the page attachment header does not work on iOS because of a known Safari issue where
position: sticky
fails if a parent element hasoverflow: auto
set (see caniuse). I attempted to replicate sticky positioning via JS by setting the header'sposition: fixed
whenever the sticky header was expected to be seen, but this also resulted in the header's layout being incorrectly altered.The current behavior on iOS page attachments is such that the header transitions to its sticky layout whenever the attachment reaches full height, only for the header to be scrolled out of view. We have decided that we will prevent the sticky header layout from being shown on iOS at all, until a working solution for sticky positioning has been implemented.
Before:

After:

/cc @gmajoulet
#34504
#35569