1886148 - IntersectionObserver not triggering to populate infinitite-scrolling comments on YouTube, in Fenix with dynamic toolbar

Status: NEW

(Web Compatibility :: Site Reports, defect, P2)

Description

[James Graham [:jgraham]]

As reported at webcompat.com, YouTube's desktop layout never reveals its comment area under videos on Fenix , when the user scrolls down to the bottom of the page. (This can be seen if viewing the desktop version of the page the usual way in Fenix).

It turns out that they rely on an IntersectionObserver to trip as a signal to show the comments:

this.observer = new IntersectionObserver(this.handleObserveEvent.bind(this), 
    // omitting some irrelevant code
    {
      rootMargin: '-0.1px'
    });

This never seems to fire on Fenix, but it does on Chrome. I'm not sure if this is specific to Fenix, so I'm filing this as a potential Gecko issue.

Comment 1

[Dennis Schubert [:denschub]]

Attachment: GitHub Pull Request to add x.com

Thanks Daniel, I submitted a PR to our addon to add those domains.

Comment 2

[Dennis Schubert [:denschub]]

Comment on attachment 9408142 [details] [review]
GitHub Pull Request to add x.com

This is embarrassing. Wrong bug.

Comment 3

[Jeff Muizelaar [:jrmuizel]]

Tim, any idea what might be going on here?

Comment 4

[James Graham [:jgraham]]

Unsetting severity for re-triage. As pointed out on matrix, if this only affects the desktop-on-mobile layout then it's probably configuration:specific, which will reduce the priority.