On 17/10/2018 01:23, Emilio Cobos Álvarez wrote:
Do you know how do reftests run in order to get that data?
I'm particularly curious about this Firefox-only failure:
It passes both on our automation and locally. I'm curious because I was
the author of that test (whoops) and the Firefox fix (bug 1449010).
Does it use the same mechanism than our automation to wait for image
decodes and such? Is there any way to see the test images?
It's using the same harness as we use in gecko, so it should be giving
the same results, but of course it's possible that there's some
difference in the configuration that could cause different results for
Unfortunately there isn't yet a way to see the images; because of the
number of failures per run, and the number of runs, putting all the
screenshots in the logs would be prohibitively large, but there is a
plan to start uploading previously unseen screenshots to wpt.fyi 
Having said that the infrastructure is all containerised and it's
possible to repeat the run locally with relatively little effort. I'm
happy to help out with that if you like.
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