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			From the Web IDL spec: https://heycam.github.io/webidl/#idl-undefined [...] undefined constant values in IDL are represented with the `undefined` token. [...] Note: This value was previously spelled `void`, and more limited in how it was allowed to be used.
		
			
				
	
	
		
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| interface EventTarget {
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| 
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|     undefined addEventListener(DOMString type, EventListener? callback);
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|     undefined removeEventListener(DOMString type, EventListener? callback);
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| 
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| };
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