[Webkit-unassigned] [Bug 25835] ScrollTop values reset when parent element toggled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=25835


Alesandro Ortiz <bugzilla-webkit at thephpjedi.com> changed:

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--- Comment #2 from Alesandro Ortiz <bugzilla-webkit at thephpjedi.com>  2011-12-07 16:11:00 PST ---
I can reproduce this issue in Chrome 15.0.874.121 m on Windows 7 64-bit. Also confirmed in Safari 5.1.1 on Mac OS X 10.7.2. So far I it does not seem platform-specific. This issue does not occur in any recent version of Firefox. Also can reproduce in Internet Explorer 9, so this may be a result of a similar implementation method.

I can post a simplified testcase later this week, but have a live site where the issue can be reproduced.

Steps to reproduce:
1. Load http://www.grovo.com/twitter-ipad-app/twitter-ipad-app-introduction
2. Pause the video once it starts playing (to prevent automatic scrolling behavior which may confuse you while trying to reproduce).
3. Click on the Engage tab (to the right of the video player).
3. Scroll to another position within the now-shown #engagebox-container element.
4. Switch to either the Lessons or Transcript tab (which will hide #engagebox, #engagebox-container's parent).
5. Switch back to the Engage tab (which will set display: block on #engagebox).

Expected results:
The scrollbar's position should be the same as before the element was hidden and shown again. #engagebox-container element's scrollTop value should not be set to 0 every time the parent element is hidden.

Actual results:
The scrollbar's position has been set to the top, as a result of the scrollTop property for #engagebox-container being set to 0.

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