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minor fixes

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`@@ -215,8 +215,6 @@ alert(clone.sizes.width); // 51, see the result from the other one`
`215`	`215`
`216`	`216`	To fix that, we should use the cloning loop that examines each value of `user[key]` and, if it's an object, then replicate its structure as well. That is called a "deep cloning".
`217`	`217`
`218`		`-There's a standard algorithm for deep cloning that handles the case above and more complex cases, called the [Structured cloning algorithm](https://html.spec.whatwg.org/multipage/structured-data.html#safe-passing-of-structured-data).`
`219`		`-`
`220`	`218`	`We can use recursion to implement it. Or, not to reinvent the wheel, take an existing implementation, for instance [_.cloneDeep(obj)](https://lodash.com/docs#cloneDeep) from the JavaScript library [lodash](https://lodash.com).`
`221`	`219`
`222`	`220`	`## Summary`

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`@@ -263,7 +263,7 @@ The window that wants to send a message calls [postMessage](mdn:api/Window.postM`
`263`	`263`	`Arguments:`
`264`	`264`
`265`	`265`	`data`
`266`		-: The data to send. Can be any object, the data is cloned using the "structured cloning algorithm". IE supports only strings, so we should `JSON.stringify` complex objects to support that browser.
	`266`	+: The data to send. Can be any object, the data is cloned using the "structured serialization algorithm". IE supports only strings, so we should `JSON.stringify` complex objects to support that browser.
`267`	`267`
`268`	`268`	`targetOrigin`
`269`	`269`	`: Specifies the origin for the target window, so that only a window from the given origin will get the message.`

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