Open Bug 1678702 Opened 2 years ago Updated 3 months ago

Slider animation is not smooth on


(Core :: CSS Transitions and Animations, defect)




Webcompat Priority P2
Tracking Status
firefox-esr78 --- unaffected
firefox83 --- wontfix
firefox84 --- wontfix
firefox85 --- wontfix
firefox86 --- disabled
firefox87 --- disabled


(Reporter: ksenia, Unassigned)


(Blocks 1 open bug, Regression, )


(Keywords: regression)

As reported in


  1. Visit in Nightly 85.0a1 (2020-11-20) on desktop
  2. Scroll down to "Nieuws in beeld 10 foto's" gallery and click on the red arrow to see the couple next photos

Slides change smoothly

Slides don't animate

From mozregression:

10:48.93 INFO: Narrowed integration regression window from [4039bc28, 20d40fcc] (4 builds) to [5099104e, 20d40fcc] (2 builds) (~1 steps left)
10:48.93 INFO: No more integration revisions, bisection finished.
10:48.93 INFO: Last good revision: 5099104ea5ee71d7069c797542e08895307affed
10:48.93 INFO: First bad revision: 20d40fcc3f751c7a7517fb691dc4e611872f2d76
10:48.93 INFO: Pushlog:

This appears to be a paid plugin called Royal Slider, similar behavior is reproducible on

Hi Hiroyuki, would you be able to take a look at this?

Flags: needinfo?(hikezoe.birchill)
Closed: 2 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1679649

No, that one is caused by a different problem. I am still investigating this, haven't found where the underlying problem is, but anyway, this case is caused by overflow: visible transform offset from the reference frame, and the overflowed area is offset-ed side.

Flags: needinfo?(hikezoe.birchill)
Resolution: DUPLICATE → ---

The severity field is not set for this bug.
:hiro, could you have a look please?

For more information, please visit auto_nag documentation.

Flags: needinfo?(hikezoe.birchill)
Severity: -- → S3
Flags: needinfo?(hikezoe.birchill)
Version: Firefox 85 → Trunk
Webcompat Priority: --- → ?
Has Regression Range: --- → yes

The gallery from the reported site is now gone, an the second linked webcompat issue is not reproducible anymore.
I came across one more report with that seems to be related to this issue. Setting layout.animation.prerender.partial to false makes animation work.

:hiro, given this appears to now affect, can you take a second look at this and see if the priority should be raised? This is still Nightly-only, but it would be good to have a look anyway.

Webcompat Priority: ? → P2
Flags: needinfo?(hikezoe.birchill)
Depends on: 1760918

I am going to disable the feature, partial pre-render, on all channels in bug 1760918.

Flags: needinfo?(hikezoe.birchill)
You need to log in before you can comment on or make changes to this bug.