Open Bug 1556685 Opened 5 years ago Updated 2 years ago

layer-pixel alignment causes undesired scroll position via some kind of CSSOM-View APIs such as scrollTop

Categories

(Core :: Layout: Scrolling and Overflow, defect, P3)

Product:
Core
Component:
Layout: Scrolling and Overflow
Type:
defect

Tracking

()

People

(Reporter: hiro, Unassigned)

References

Details

(Whiteboard: [wpt-triaged])

See bug 1554024 comment 7 for example, and bug 1554022 comment 5 is also an interesting case.

I will attach a mochitest to replicate this issue tomorrow.

Hmm, the mochitest I wrote doesn't fail as expected. So, I provide a way to see the issue, that is;

./mach wpt --setpref "layout.css.devPixelsPerPx=1.61" testing/web-platform/tests/css/cssom-view/scroll-behavior-smooth.html

You might need to change the devPixelsPerPx value on your environment.

CCing Karl since I am bit worried that this bug causes webcompat issues on GeckoView applications. If 1-pixel (or maybe worse?) differences appear on GeckoView but not on Fennec, it's this bug.

Whiteboard: [wpt-triaged]
Severity: normal → S3
Severity: normal → S3
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