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Window.postMessage() Edit page View complete diff View page history	Oct 10, 2013 10:57:48 AM	Clarity: 'only' was redundant and confusing when followed by 'if and only if' (the 'only' is already implied).

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Oct 10, 2013
10:57:48 AM

Clarity: 'only' was redundant and confusing when followed by 'if and only if' (the 'only' is already implied).