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Issue metadata

Status: Duplicate
Merged: issue 639718
Owner:
Closed: Sep 2016
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: All
Pri: 1
Type: Bug

Blocking:
issue 614588
issue 614589



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Dropdowns stacking behind other content

Project Member Reported by michae...@chromium.org, Sep 1 2016

Issue description

Version: 54.0.2837.0

At some point iron-dropdowns have started doing weird things, like displaying behind content they normally display in front of.

Example: Manage Search Engines (screenshot attached). The following settings-search-engine-entry rows overlap the dropdown content, even though the iron-dropdown is position:fixed; z-index: 103.

Possibly related:  issue 642301 ,  issue 642632 .
 
Cc: steve...@chromium.org

Comment 2 by dbeam@chromium.org, Sep 1 2016

Cc: valdrin@google.com
Small repro: https://jsfiddle.net/6c0thtne/

iron-list uses transforms which create stacking contexts. is my guess as to why this happens.
Cc: egarciad@chromium.org
Owner: steve...@chromium.org
Status: Assigned (was: Untriaged)
Yeah, I was planning to investigate this along with the other dropdown items on my plate.

Quoting egarciad:

yeah that's a known issue
the problem is stacking contexts
every list item has transform:translate3d which creates a layer so those layer aren't on the same stacking context.  
and their z position depends on DOM ordering.
I would suggest moving the dropdown outside the list item.

Mergedinto: 639718
Status: Duplicate (was: Assigned)

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