paper_bgcolor and plot_bgcolor validation throws exception #2774
Description
Plotly.validate() throws and exception if either paper_bgcolor or plot_bgcolor is in the layout. Example: https://jsfiddle.net/tbitai/ohm5cuwr/
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Plotly.validate() throws and exception if either paper_bgcolor or plot_bgcolor is in the layout. Example: https://jsfiddle.net/tbitai/ohm5cuwr/