1485540 - The automatic fade in / fade out of a navigation bar, causes a jump of the content of a website.

Status: RESOLVED INACTIVE

(Firefox for Android Graveyard :: Toolbar, defect)

Description

[Kay Schubert]

If you scroll in the upper part of the website, a navigation bar is automatically fade in and out. This causes the content of the website to jump, which is annoying. I think the content should not jump.

Comment 1

[Stefan Deiac]

Hi, I tried your issue with the following device: Motorola Nexus 6 (Android 7.1.1), Nokia 6 (Android 7.1.1) and OnePlus 5T (Android 8.1.0) on latest version of Nightly 63.0a1 (08-23-2018) and Release 61.0.2 but I can't reproduce it. 
Can you provide us more information regarding your device? (make and android version)
Also, you have some additional steps to reproduce your issue or specific settings?

Comment 2

[Kay Schubert]

Hi, thanks for the fast processing. I use a HUAWEI tablet, the Android version I dont't know (how can I find it out?)

To reproduce the jump of the content, please do the following:

1. go to the middle or bottom of the page, so that the navigation bar is visible
2. scroll up in steps from music track to music track (make a short pause after each step)
3. during the scroll step, when the navigation bar is fade out, the content jumps at least two music tracks

It must be an issue with Firefox, with Google Chrome there is no jump of the conent.

Comment 3

[Stefan Deiac]

Tested with Samsung Galaxy Tab S3 (Android 8.0) and Huawei MediaPad M2 (Android 5.1.1) and still can't reproduce your issue (please note that I tried several times). 
You can find your android version by going on device settings-> About Tablet->Android version. Also, can you send us a video with your issue?

Comment 4

[Kay Schubert]

Thanks for the hint:

MediaPad 10 Link+
Android 4.2.2
EmotionUI 1.6 for Tablet
Baseband-Version 21.526.00.00.000
Kernel-Version 3.0.8
Build-Number S10-231uV100R001C167B001

I 100% belive, that you can't reproduce it. It seems related with my old Android version.

Comment 5

[Oana Horvath [:ohorvath - out of office]]

Attachment: example.mp4

I can reproduce the issue on a Lenovo Yoga Tablet 2 (Android 4.4.2). See the attached video. But it looks like there is already a similar bug opened for this: Bug 1277712

Comment 7

[Kay Schubert]

Thanks for reproducing my issue, but the other issue is similar and not identical. In the other bug, the browsers URL bar causes the jump in the image and in my bug the navigation bar of a website causes the jump of a website content. Also in my bug the jump direction corresponds with the scroll direction.

So please remove the duplicate and reopen my bug.

Comment 8

[Jan Henning [:JanH]]

I'd tend to agree, image documents are a special case anyway. If anything, this might be due to bug 1064982, or one of the other viewport-related bugs (bug 1123938), but this needs a little more investigation into what is actually happening on that page.