Something about the attached testcase seems to cause the CSS transformation to be ignored on the black element therein, as compared to Chrome and Safari.

If I drop the perspective on the body, or the backface-visibility:hidden, it works. I'm not sure which of the existing related bugs this might be, or if it's a new one, so I'm filing a new bug.

This was reported at webcompat.com, and impacts a photo model's gallery (which is NSFW, https://www.patalan.eu/en/) . Clicking on the title there should animate the images with the transformation in the test-case, yet does not in Firefox.

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=dab17001496e9c081e75f64a8a88783c89e23a24&tochange=5b893577aa19cba4736158327e6e2465bd9044c8

Set release status flags based on info from the regressing bug 1772049

:gw, since you are the author of the regressor, bug 1772049, could you take a look? Also, could you set the severity field?

For more information, please visit auto_nag documentation.

Reclassifying to WebRender based on the identified regressed-by bug.

Set release status flags based on info from the regressing bug 1772049

Looks like it's too late for 107.
Leaving 108 status clear, unless anyone thinks we should be following this for a fix in 108?

Is this working for you now?

Yes, it seems to be working fine now, thanks! (also the webcompat.com issue that I mentioned).