The content alignment of the panel.
The default is 'start'.
The split layout to use for the split panel.
If this is provided, the other options are ignored.
The default is a new SplitLayout.
The layout orientation of the panel.
The default is 'horizontal'.
The renderer to use for the split panel.
The default is a shared renderer instance.
The spacing between items in the panel.
The default is 4.
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An options object for initializing a split panel.