Carol Willing added the comment:

Biwan John, thanks for the issue report.

I can confirm that there is jitter due to scroll speed lag in Chrome for Python 2.7 docs. This behavior does not happen with Python 3.x docs. No issues with Firefox.

I am using Mac OS X 10.10 with up-to-date Chrome and Firefox.

I believe that this is likely a Chrome scroll issue and not a Python docs or Sphinx issue.

I have triaged this as "needs patch" in case someone is aware of a workaround to resolve. If this is still open after a month, I would recommend closing the issue as a "third party" issue

---------- nosy: +willingc priority: normal -> low stage: -> needs patch

_______________________________________ Python tracker report@bugs.python.org http://bugs.python.org/issue24712 _______________________________________

Changes by asal ada asalada41@gmail.com:

---------- components: +2to3 (2.x to 3.x conversion tool), Benchmarks, Build, Cross-Build, Demos and Tools, IO, Installation, Interpreter Core, Library (Lib), Tests, Unicode, Windows, XML, email nosy: +barry, haypo, paul.moore, r.david.murray, steve.dower, tim.golden, zach.ware

_______________________________________ Python tracker report@bugs.python.org http://bugs.python.org/issue24712 _______________________________________

Biwin John added the comment:

The problem exist with the Chrome on Ubuntu, Windows and OSX, but ony with the python docs for version 2.7.

Docs for 2.6 use the same sidebar.

But in 2.7 docs, the content of sidebar is positioned with the style added on scroll,

style="float: left; margin-right: 0px; width: 202px; top: 13px;"

The top value is calculated on scroll, the same code works with FireFox without any problem.

So it might be the way chrome handles the change in values. And we must workaround with our code than waiting for Chrome to get fixed.

Needs to be fixed as, 2.7 is the most used version, comes default with most distros and chrome is the most used browser (50.25% of all)[https://en.wikipedia.org/wiki/Usage_share_of_web_browsers]

Recommendations: 1. Change the sidebar behavior to the 2.6 docs sidebar one.(default top value, users can scroll up to see the content) or. 2. Make the sidebar position:fixed and provide a inner scroll bar.

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_______________________________________ Python tracker report@bugs.python.org http://bugs.python.org/issue24712 _______________________________________

Kartikaya Gupta added the comment:

Please note that this issue will affect Firefox 46 and up as well; we have enabled asynchronous scrolling as of Firefox 46.

Bugzilla bug for this issue: https://bugzilla.mozilla.org/show_bug.cgi?id=997269 Announcement for asynchronous scrolling: https://groups.google.com/d/msg/mozilla.dev.platform/X2BwGm348jI/Tl26C_1JBAA...

Also, in Firefox 46 and up, if you open the browser's web console and scroll these documentation pages, you should see a warning about scroll-linked effects with pointers to additional info on why this is happening.

---------- nosy: +kats

_______________________________________ Python tracker report@bugs.python.org http://bugs.python.org/issue24712 _______________________________________

Mike Taylor added the comment:

I can reproduce on Chrome and Firefox Nightly --

Carol, if I'd like to write a patch where would I do that? I see https://github.com/python/pythondotorg, but am not sure that's the right repo. Thanks!

---------- nosy: +Mike Taylor

_______________________________________ Python tracker report@bugs.python.org http://bugs.python.org/issue24712 _______________________________________

Mike Taylor added the comment:

Great, thanks Ezio! Will take a stab now.

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_______________________________________ Python tracker report@bugs.python.org http://bugs.python.org/issue24712 _______________________________________

Mike Taylor added the comment:

The bug for Chrome to ship support of position: sticky is here: https://bugs.chromium.org/p/chromium/issues/detail?id=231752 -- it's in active development.

But this patch fixes the jerky sidebar in Firefox as well.

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_______________________________________ Python tracker report@bugs.python.org http://bugs.python.org/issue24712 _______________________________________

Change by Julien Palard julien+python@palard.fr:

---------- pull_requests: +13095 stage: needs patch -> patch review

_______________________________________ Python tracker report@bugs.python.org https://bugs.python.org/issue24712 _______________________________________

Change by Stéphane Wirtel stephane@wirtel.be:

---------- resolution: -> fixed stage: patch review -> resolved status: open -> closed

_______________________________________ Python tracker report@bugs.python.org https://bugs.python.org/issue24712 _______________________________________