The following table show how nested tables inherit colors from the wikitable class (here it was renamed "global").
Global table
	| TH: should have pink bg | 
	| TD: white bg | 
	| 
		Nested table
		
			| Nested TH: transparent | Nested TD: transparent |  | 
With child selector we could limit the wikitable styling to the direct childs of the table. Unfortunately, Internet Explorer 6.0 does not support child selector. See our bug #33752.
Global table
	| TH: should have pink bg | 
	| TD: white bg | 
	| 
		Nested table
		
			| Nested TH: transparent | Nested TD: transparent |  | 
NOTE:The nested caption keep the green background. The nested table keep the black border. This is because those declarations are global so we did not reset them.