Able to reproduce the issue on latest Chrome Stable i.e., 67.0.3396.62 on Windows,Mac and Linux :


You are probably looking for a change made after 543290 (known good), but no later than 543291 (first known bad).
CHANGELOG URL:
The script might not always return single CL as suspect as some perf builds might get missing due to failure.
  https://chromium.googlesource.com/chromium/src/+log/63667eca2a1d86f5de61f29c7c5c6417cc351757..3a3c78a924a686ed0d3f90d765b00cdd78453e11
 

Let's target M68.

Reduced test case

Expected: the box should be always have blue background.
Actual: the box's background disappears when scrolled down.

Seems related to incorrect composited background layer offset (with subpixels).

Deleted: bg-fixed.html 309 bytes

bg-fixed.html 309 bytes View Download

quinnj83@gmail.com, thanks for the report, and sorry for the break. Before the fix is available, you can try to avoid the issue by adding "position: static" on the div with the fixed attachment background.

I think this is the SPv175 version of  bug 529963 .
trchen@ can you take a look?

(My statement in #c3 about composited background layer is incorrect. There is no composited background layer actually.)

Friendly ping to get an update on this issue as it is marked as RBS for M68.
Thanks..!

Fix pending: https://chromium-review.googlesource.com/c/chromium/src/+/1098313

 Issue 848208  has been merged into this issue.

 Issue 852339  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6bfdf66c7331d13158b731eeed637d490ace174d

commit 6bfdf66c7331d13158b731eeed637d490ace174d
Author: Tien-Ren Chen <trchen@chromium.org>
Date: Wed Jun 13 22:46:13 2018

[Blink/SPv175] Fix background-attachment:fixed for SPv175

This CL fixes two bugs with background-attachment:fixed computation:

1. Since CL 827671 we switch root layer in PaintInfo whenever the
current transform node changes. This has a side effect that the painting
root layer is no longer guaranteed to be a containing block ancestor of
the current layout object, and AccumulatedScrollOffsetForFixedBackground()
may skip over the painting root all the way to the root. This CL adds
the skipping check to ensure we only collect scroll offsets up to the
painting root.

2. FixedAttachmentPositioningArea() converts the viewport rect to the
space of the current paint context. Prior to SPv175 the border box space
of the painting root is always equivalent to the space of the current
paint context, so FixedAttachmentPositioningArea() did just that. In
SPv175 the painting root may not always create a paint offset
translation in case of a squashed layer, thus can induce an offset from
its transform node. This CL ensures the paint offset taken into account.

BUG= 529963 , 849854 

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ib2f84a619235ab4ec6a9bfc695b57aae9d41b808
Reviewed-on: https://chromium-review.googlesource.com/1098313
Commit-Queue: Tien-Ren Chen <trchen@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567030}
[add] https://crrev.com/6bfdf66c7331d13158b731eeed637d490ace174d/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-on-abs-pos-expected.html
[add] https://crrev.com/6bfdf66c7331d13158b731eeed637d490ace174d/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-on-abs-pos.html
[add] https://crrev.com/6bfdf66c7331d13158b731eeed637d490ace174d/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-squashed-expected.html
[add] https://crrev.com/6bfdf66c7331d13158b731eeed637d490ace174d/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-squashed.html
[modify] https://crrev.com/6bfdf66c7331d13158b731eeed637d490ace174d/third_party/blink/renderer/core/paint/background_image_geometry.cc

I beleive this is the same issue,
https://codepen.io/anon/pen/jKLKPE

Expecting to see the background remain in place when scrolling the page, and in edge and firefox this is the case. In chrome the background scrolls down and off the screen and blinks white failing to render at all at times.

Google Chrome	67.0.3396.87 (Official Build) (64-bit) (cohort: Stable)

I've seen the same symptom on various websites with parallax backgrounds and condensed down this example. 

This bug requires manual review: M68 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), kariahda@(iOS), bhthompson@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Verified the fix on Mac 10.13.1, Windows-10 and Ubuntu 14.04 using Chrome version #69.0.3461.2 as per the reduced test case given in comment#3.
Attaching screen cast for reference.
Observed that box maintained blue background while scrolling.
Hence, the fix is working as expected. 
Adding the verified labels.
Note: Able to reproduce the issue on chrome version 67.0.3396.62

Thanks...!!

Deleted: 849854.mp4 525 KB

	849854.mp4 525 KB View Download

Approved - branch:3440

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b99f46198c730a42f52a2827daf27f6b7a14dd20

commit b99f46198c730a42f52a2827daf27f6b7a14dd20
Author: Tien-Ren Chen <trchen@chromium.org>
Date: Mon Jun 18 21:26:29 2018

[Blink/SPv175] Fix background-attachment:fixed for SPv175

This CL fixes two bugs with background-attachment:fixed computation:

1. Since CL 827671 we switch root layer in PaintInfo whenever the
current transform node changes. This has a side effect that the painting
root layer is no longer guaranteed to be a containing block ancestor of
the current layout object, and AccumulatedScrollOffsetForFixedBackground()
may skip over the painting root all the way to the root. This CL adds
the skipping check to ensure we only collect scroll offsets up to the
painting root.

2. FixedAttachmentPositioningArea() converts the viewport rect to the
space of the current paint context. Prior to SPv175 the border box space
of the painting root is always equivalent to the space of the current
paint context, so FixedAttachmentPositioningArea() did just that. In
SPv175 the painting root may not always create a paint offset
translation in case of a squashed layer, thus can induce an offset from
its transform node. This CL ensures the paint offset taken into account.

BUG= 529963 , 849854 

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ib2f84a619235ab4ec6a9bfc695b57aae9d41b808
Reviewed-on: https://chromium-review.googlesource.com/1098313
Commit-Queue: Tien-Ren Chen <trchen@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#567030}(cherry picked from commit 6bfdf66c7331d13158b731eeed637d490ace174d)
Reviewed-on: https://chromium-review.googlesource.com/1105238
Reviewed-by: Tien-Ren Chen <trchen@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#420}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
[add] https://crrev.com/b99f46198c730a42f52a2827daf27f6b7a14dd20/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-on-abs-pos-expected.html
[add] https://crrev.com/b99f46198c730a42f52a2827daf27f6b7a14dd20/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-on-abs-pos.html
[add] https://crrev.com/b99f46198c730a42f52a2827daf27f6b7a14dd20/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-squashed-expected.html
[add] https://crrev.com/b99f46198c730a42f52a2827daf27f6b7a14dd20/third_party/WebKit/LayoutTests/fast/backgrounds/background-attachment-fixed-squashed.html
[modify] https://crrev.com/b99f46198c730a42f52a2827daf27f6b7a14dd20/third_party/blink/renderer/core/paint/background_image_geometry.cc

Pls merge you change to M68 branch 3440 ASAP so we can pick it up for this week Beta release. Merge has to happen latest by 1:00 PM PT tomorrow, Tuesday (06/19), so we can pick it up for Wednesday Beta release.

 Issue 854065  has been merged into this issue.

Verified the fix on Mac 10.13.1, Windows-10 and Ubuntu 14.04 using Chrome version #68.0.3440.33 as per the reduced test case given in comment#3.
Attaching screen cast for reference.
Observed that box maintained blue background while scrolling.
Hence, the fix is working as expected. 
Adding the verified labels.
Note: Able to reproduce the issue on chrome version 67.0.3396.62

Thanks...!!

Deleted: 849854.mp4 708 KB

	849854.mp4 708 KB View Download

Seems to still be an issue on the Android mobile version of Google Chrome. My version is 68.0.3440.70 (Official Build) (32-bit). OS: Android 8.0.0

I noticed this issue when working on a website, and confirmed it with the reduced test (I put the code in both JSFiddle and Codepen and got the same results). 

Android does not support fixed backgrounds in some situations due to computational cost. This bug was for problems with desktop versions.