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Numerous visible reflows for WikibaseMediaInfo to settle on file pages
Open, Needs TriagePublic

Description

  1. Loading a file description page, such as File:En-Anne_Tomasevich.oga (sorry Anne!).
  2. Observe the top of the page undergoing numerous changes that are each unnecessarily layout-shifting.
  3. Observe the bottom of the page having content appear and dissappear.

Reproducible in Safari and Firefox, both logged-in and not, including with ?safemode=on to rule out user scripts/styles.

Top

Kapture 2.gif (400×850 px, 512 KB)

Top
a.png (552×1 px, 77 KB)
b.png (610×1 px, 89 KB)
c.png (686×1 px, 139 KB)
d.png (680×1 px, 123 KB)
Unstyled tabs.Tabs get layout. Panel gets different layout, various height/padding changes.Panel gone + tab colour.Panel back + different languages.
Bottom
Bottom
capture.png (1×1 px, 199 KB)
Panel appears on bottom of page, then disappears.

Kapture 1.gif (512×869 px, 839 KB)

Event Timeline

Restricted Application added a subscriber: Aklapper. · View Herald Transcript

I suspect this may be a regression, as I'd like to think I would have noticed this earlier had it always been that way (either in any past week, or during the perf review for launch). However, it's possible that we missed this somehow?

The whole page was like this for months, if not since the launch. It also prevents from leaving the page with ‘Are you sure you want to lose changes?’ dialog sometimes. Good that someone finally filed a task (as it would’ve been out of my wheelhouse to explain it).