Visiting https://en.m.wikipedia.beta.wmflabs.org/wiki/User:Wik781?debug=true#/talk prints the following migration warning:
JQMIGRATE: jQuery(window).on('load'...) called after load event occurred migrateWarn @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:10340 jQuery.event.add @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:10698 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:4962 each @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:362 each @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:157 on @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:4961 on @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:5570 postRender @ Page.js?ce23d:235 render @ View.js?d4b09:244 _postInitialize @ View.js?d4b09:203 initialize @ View.js?d4b09:184 View @ View.js?d4b09:88 Page @ Page.js?ce23d:24 _addContent @ TalkOverlay.js?e4d40:127 (anonymous) @ TalkOverlay.js?e4d40:105 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 deferred.(anonymous function) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3778 proxy @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:496 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 deferred.(anonymous function) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3778 (anonymous) @ api.js?8308a:268 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 done @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:9272 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:9514 XMLHttpRequest.send (async) send @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:9566 ajax @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:9173 jQuery.ajax @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:10483 ajax @ api.js?8308a:246 get @ api.js?8308a:134 getPage @ PageGateway.js?90ce1:117 _loadContent @ TalkOverlay.js?e4d40:100 postRender @ TalkOverlay.js?e4d40:61 render @ View.js?d4b09:244 _postInitialize @ View.js?d4b09:203 initialize @ View.js?d4b09:184 View @ View.js?d4b09:88 Overlay @ Overlay.js?64e89:21 TalkOverlayBase @ TalkOverlayBase.js?f3a41:19 TalkOverlay @ TalkOverlay.js?e4d40:16 (anonymous) @ init.js?0ab03:56 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 mightThrow @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3642 process @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3651 setTimeout (async) (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3689 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3455 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 deferred.(anonymous function) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3778 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:12912 handlePending @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:11945 markModuleReady @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:12186 nestedAddScript @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:12193 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:12198 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 deferred.(anonymous function) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3778 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:12123 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:3447 done @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:9272 callback @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:9639 dispatch @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:5206 elemData.handle @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=minerva&version=09gt2zl:5014
Page::postRender binds an event to window.load which will never run. It was introduced to fix T91882 however removing the code doesn't seem to cause any problems as T141452 fixed this problem in a more generic fashion in resources/mobile.toggle/toggle.js
Upgrade instructions here: https://github.com/jquery/jquery-migrate/blob/master/warnings.md#jqmigrate-jquerywindowonload-called-after-load-event-occurred
Acceptance criteria
- Remove the postRender method