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Verified on Mac: FF and Chrome.
You can see the clipping where the dropdown menu appears partially underneath the copyright message that occurs outside the .tabbable area. In addition (not visible) a vertical scroll bar appears when the dropdown is expanded.
This seems like the easiest way to share my page structure:
In order to make this work correctly in my app, I added the following override:
For now this code is required to ensure left and right aligned tabs work properly. We'll investigate further when we can, but this was the result of lots of testing thus far.