[Wikidata-bugs] [Maniphest] [Commented On] T173949: ext.math.styles is sometimes loaded when not needed - causing CSS size in production to fluctuate - parser cache pollution?

[Krinkle]

Krinkle added a comment.

@Jdlrobson It does indeed appear to be a bug somewhere relating to cache pollution, in particular it seems a cache key somewhere is being shared between mobile and desktop that shouldn't be.

I can reproduce the following in Incognito mode (with disabled cache):

1. (Desktop) View https://en.wikipedia.org/wiki/Barack_Obama, check Dev Tools/Network/CSS. Observe main stylesheet does not include ext.math.styles.
2. (Mobile) View https://en.m.wikipedia.org/wiki/Barack_Obama, observe the main stylesheet includes ext.math.styles.
3. (Mobile purge) https://en.m.wikipedia.org/wiki/Barack_Obama?action="">, confirm. Then reload https://en.m.wikipedia.org/wiki/Barack_Obama, observe the main stylesheet still includes ext.math.styles.
4. (Desktop) View https://en.wikipedia.org/wiki/Barack_Obama, observe the main stylesheet now also includes ext.math.styles.
5. (Desktop purge) View https://en.wikipedia.org/wiki/Barack_Obama?action="">, confirm. Reload and confirm it is no longer included on desktop. (Mobile) View https://en.m.wikipedia.org/wiki/Barack_Obama, observe the main stylesheet does not include ext.math.styles.

Point 1	Point 2	Point 3
F22262922: cap1-desktop.png	F22263103: cap3-mobile.png	F22263104: cap2-mobile.png

Point 4	Point 5
F22263105: cap5-mobile.png	F22263106: cap4-desktop.png

So it seems that whenever the last purge came from mobile, the module is included, whenever the last purge came from desktop, it is (correctly) not included.

I'd recommend trying to reproduce it locally, and on Beta Cluster, and on different production wikis. That would help narrow it down somewhat.

TASK DETAIL

https://phabricator.wikimedia.org/T173949

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To: Krinkle
Cc: Physikerwelt, Krinkle, brion, Niedzielski, greg, TerraCodes, Liuxinyu970226, Peter, Jdlrobson, Volker_E, Aklapper, Imarlier, Lahi, Gq86, Darkminds3113, GoranSMilovanovic, Maosef, QZanden, LawExplorer, Winter, Vali.matei, JJMC89, Debenben, Bianjiang, Nirmos, Cwek, Wikidata-bugs, aude, fredw, GWicke, Pkra, Dinoguy1000, ssastry, scfc, Arlolra, Jackmcbarn, Mbch331, Jay8g

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