[wp-trac] [WordPress Trac] #55491: Replace `unload` event handlers from core

[WordPress Trac]

#55491: Replace `unload` event handlers from core
----------------------------+--------------------------------------
 Reporter:  shawfactor      |       Owner:  westonruter
     Type:  defect (bug)    |      Status:  accepted
 Priority:  normal          |   Milestone:  6.4
Component:  Administration  |     Version:
 Severity:  normal          |  Resolution:
 Keywords:  has-patch       |     Focuses:  javascript, performance
----------------------------+--------------------------------------

Comment (by westonruter):

 OK, I think I've done all I can with this PR. The only outstanding
 question is whether some decade-plus iOS Safari bugs still need special
 workarounds: one of them was removed in the PR, and the other remains. I
 can't test these as I don't have an iOS device available. It's ready for
 review, although it will benefit most from someone like @azaozz who has
 extensive experience with the related screens (legacy media uploads and
 the classic editor).

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/55491#comment:35>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform