Open Bug 1429653 Opened 6 years ago Updated 1 year ago

[mobile] reddit.com - scrolling is not happening on position fixed element with overflow scroll

Categories

(Core :: Web Painting, defect, P3)

59 Branch
ARM
Android
defect

Tracking

()

Webcompat Priority P3
Tracking Status
firefox57 --- affected
firefox58 --- affected
firefox59 --- affected

People

(Reporter: karlcow, Unassigned)

References

()

Details

(Whiteboard: [webcompat:p3] [css])

This is a spin-off of a webcompat issue.
https://webcompat.com/issues/10088

The behavior is strange.
This is happening on a high profile Web site, aka reddit on mobile Android only. 

Steps to reproduce:

1. Go to reddit 
2. Login 
3. Click on the top reddit button to expand the menu
4. Click on the subscribed topics (You need enough topic that it is taller than the viewport)
5. Try scrolling the list.

It doesn't scroll in Firefox Android.
It does scroll on Firefox Desktop RDM with firefox Android UA.
It does scroll on Safari/Chrome on Mobile.

When modifying a bit the css to be able to see the menu and the content behind, if we try to scroll the menu, we realize that the background main content is flickering, like if the scroll was partially attempting to happen on the content behind. 

Once we hide the content behind, we can scroll easily.


See full details in https://webcompat.com/issues/10088
Summary: You can't scroll subscribed topics → [mobile] reddit.com - scrolling is not happening on position fixed element with overflow scroll
Flags: webcompat?
Component: Layout: View Rendering → Layout: Web Painting
Adding to webcompat:p3 list because this is a top site.
Flags: webcompat? → webcompat+
Whiteboard: [webcompat] [css] → [webcompat:p3] [css]

See bug 1547409. Migrating webcompat priority whiteboard tags to project flags.

Webcompat Priority: --- → P3
Severity: normal → S3

Did we get a reduced testcase for this? Or a testcase? Is this still happening?

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