Page rendering issue (Pale Moon v28.3.0)

Tomaso · Unread post by **Tomaso** » 2019-01-16, 16:19

The problem is even worse at this subpage:
https://www.vg.no/sport/

In PM v28.3.0, only a few images at the top loads successfully, while the rest fails completely!
Scrolling down and up again doesn't help, neither does refreshing the page.
And like before, the page loads just fine in PM v28.2.2 and other browsers.

@Moonchild:
There are no errors in the console at this subpage.
Perhaps you could troubleshoot the issue there?

van p · Unread post by **van p** » 2019-01-16, 17:08

Tried the subpage. Seems OK to me.

Tomaso · Unread post by **Tomaso** » 2019-01-16, 17:12

We've already established that this particular issue might be OS dependent.

JustOff · Unread post by **JustOff** » 2019-01-16, 17:14

Tomaso wrote:The problem is even worse at this subpage:
https://www.vg.no/sport/

I can confirm that (Pale Moon x32; Win7x64).

I also tried to reverse Issue #903 (UXP) and found it is not related. Further investigation required.

PS: Both 28.2.2 and 28.3.0 produce several errors in the console, but they are exactly the same, so it seems they are not related to the problem.

Tomaso · Unread post by **Tomaso** » 2019-01-16, 17:45

Thanks for confirming, and for ruling out that commit, JustOff.
I ran a bunch of FF builds through mozregression earlier, but weren't able to find a single build that was affected.

JustOff · Unread post by **JustOff** » 2019-01-16, 17:47

I thinks this problem is caused by the enabling of the Intersection Observer API, see Issue #249 (UXP).

When dom.IntersectionObserver.enabled is false, https://www.vg.no/sport/ is displayed fine on 28.3.0.

badnick · Unread post by **badnick** » 2019-01-16, 17:50

Tomaso wrote:The problem is even worse at this subpage:
https://www.vg.no/sport/

Yes, this doen't work.

Tomaso · Unread post by **Tomaso** » 2019-01-16, 18:01

JustOff wrote:I thinks this problem is caused by the enabling of the Intersection Observer API, see Issue #249 (UXP).

When dom.IntersectionObserver.enabled is false, https://www.vg.no/sport/ is displayed fine on 28.3.0.

Confirmed!

Thanks a bunch for troubleshooting this, JustOff!
Guess the only thing that remains now is to find the faulty commit?
VG.no is the largest news site here in Norway, so if this issue remains unfixed, Pale Moon will probably loose some users.

therube · Unread post by **therube** » 2019-01-17, 01:11

I started looking again before realizing you'd already figured out a "fix", so even though you don't like it, "me to".
Confirmed. Toggling dom.IntersectionObserver.enabled "fixes" it.

And I'd also like to say, damn, some of you guys are really good

.

Unread post by **Moonchild** » 2019-01-17, 02:31

Just because it has "lazy" in it doesn't mean it's related.

Unread post by **Moonchild** » 2019-01-17, 13:50

The question is then: is this because of a bug in our implementation of intersectionobservers, or is it a bug in how the site tries to use them?

yami_ · Unread post by **yami_** » 2019-01-17, 14:04

Last time I have checked some things were missing form UXP implementation (viewtopic.php?f=3&t=20208&p=153048#p152820). But that was a few months ago.

Tomaso · Unread post by **Tomaso** » 2019-01-17, 14:20

Moonchild wrote:The question is then: is this because of a bug in our implementation of intersectionobservers, or is it a bug in how the site tries to use them?

At least, the fact that no other browsers than PM28.3 seems to be affected by this issue, points to the former.

Unread post by **Moonchild** » 2019-01-17, 16:33

yami_ wrote:Last time I have checked some things were missing form UXP implementation (viewtopic.php?f=3&t=20208&p=153048#p152820). But that was a few months ago.

I've done a lot of work on them to align with the spec recently. I didn't see any other BZ bugs related to them so gathered what I had was complete.

Unread post by **Moonchild** » 2019-01-17, 17:22

Looks like we may be missing an API property which was added because web devs apparently have trouble grasping that "0% intersection == not intersecting"...

I'm on it.

Tomaso · Unread post by **Tomaso** » 2019-01-17, 19:58

Thanks for fixing this, Moonchild!
I'm glad it turned out to be a PM issue, since issues can be reported here, and actually gets fixed when confirmed by devs.
If it had been a website issue, it would have been a real problem, since most webmasters never listens to user feedback (except perhaps when it comes from Chrome users).

Since the fix has been confirmed working by JustOff (@ GitHub), I'm marking this as "solved"!

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