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Issue 677794 link

Starred by 3 users

Issue metadata

Status: WontFix
Owner:
Closed: Jan 2017
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows , Mac
Pri: 2
Type: Bug-Regression



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[scroll anchoring] feedback loop on http://toolsqa.com/selenium-training/

Project Member Reported by sc00335...@techmahindra.com, Jan 2 2017

Issue description

Chrome Version: 57.0.2969.0 dev
OS: Ubuntu 14.04,Windows

Test URL: http://toolsqa.com/selenium-training/

What steps will reproduce the problem?
(1) Launch chrome and go to http://toolsqa.com/selenium-training/
(2) Scroll down using mouse wheel till enrolment form >> Now scroll up again using mouse wheel and observe. [Please refer video]

Expected: No flickering should be seen on scrolling upwards.
Actual: Instead page flickers on scrolling.

This is a regression issue broken in M56. Will provide bisect info soon.
 
Actual_flickering.ogv
16.0 MB Download
Expected_flickering.ogv
15.6 MB Download
Labels: OS-Mac
Status: Untriaged (was: Unconfirmed)
able to reproduce the issue on Mac 10.12.1 using chrome version 57.0.2969.0 
Manual Bisect Info:
====================
Good Build:56.0.2895.0 dev
Bad Build:56.0.2896.0 dev
Labels: ReleaseBlock-Stable
Labels: -M-57 M-56
Cc: hdodda@chromium.org
Labels: -Needs-Bisect hasbsect-per-revision
Owner: skobes@chromium.org
Status: Assigned (was: Untriaged)
Using the per-revision bisect providing the bisect results,
Good Build:56.0.2895.0 dev (Revision :426105)
Bad Build:56.0.2896.0 dev (Revision :426358)

You are probably looking for a change made after 426336 (known good), but no later than 426337 (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/bf2f3855e7e22042ad5d11e785b13d6e7c84127a..6d380ba3ab246a15d6269a75328f481336b53ee1

From the CL above, assigning the issue to the concern owner 

@skobes - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Review-Url: https://chromiumcodereview.appspot.com/2421263003

Thanks!
Cc: skobes@chromium.org
Owner: ojan@chromium.org
Assigning to one of the reviewers since owner is OOO.

FYI: Your bug is labelled as Stable Release Block, please make sure to land the fix and get it merged into the release branch ASAP so we can take it for next week's Beta release for Desktop. Thank you!
Still able to reproduce the issue on windows  7 using chrome version 57.0.2976.0.

ojan@ Please please look into this stable blocker issue.

Comment 8 by ojan@chromium.org, Jan 10 2017

Cc: ymalik@chromium.org
Owner: skobes@chromium.org
sc00335628, do you own the site in question or have a contact there? Most likely this will need them to modify the page to fix this.

Looks like skobes gets back from vacation on Wednesday. I won't be able to get to this this week in either case.
@ojan: I don't have any contact with that team.

This issue is also reproducible with https://www.voonik.com/ too. 
Labels: -Pri-1 -ReleaseBlock-Stable -hasbsect-per-revision Pri-2
This is another scroll anchoring content-shift feedback loop.

At the sticky header threshold, the page makes DOM changes inside the .header-bar element (moving #primary-menu into #phantom which is position:fixed, and setting display:none on .branding > a).

The website can avoid this by adding padding to avoid the content shift, or by opting out of scroll anchoring.
Labels: Scroll-Anchoring-Regressions
Summary: [scroll anchoring] feedback loop on http://toolsqa.com/selenium-training/ (was: Regression: Weird flickering of page is seen on scrolling in http://toolsqa.com/selenium-training/)
Cc: msrchandra@chromium.org ranjitkan@chromium.org nyerramilli@chromium.org
 Issue 682621  has been merged into this issue.
Cc: bokan@chromium.org rbasuvula@chromium.org
 Issue 682655  has been merged into this issue.
Cc: ojan@chromium.org
Status: WontFix (was: Assigned)
We don't currently have plans to address this in the browser.

Scroll anchoring has a known risk of breakage in a small subset of broken sticky-header implementations.  I'm tagging these reports with the Scroll-Anchoring-Regressions label.  We will monitor the list (https://bugs.chromium.org/p/chromium/issues/list?can=1&q=label%3AScroll-Anchoring-Regressions) as scroll anchoring rolls out.  If it grows too large we may unship the feature, but I don't think we're at that threshold yet.
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Cc: vamshi.k...@techmahindra.com
 Issue 799514  has been merged into this issue.

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