Commit 2ac7526

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minor fixes

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Original file line number	Diff line number	Diff line change
`@@ -199,7 +199,7 @@ window.addEventListener("beforeunload", (event) => {`
`199`	`199`	Instead, in such handlers one should set `event.returnValue` to a string to get the result similar to the code above:
`200`	`200`	```js run
`201`	`201`	`window.addEventListener("beforeunload", (event) => {`
`202`		`- // same as returning from window.onbeforeunload`
	`202`	`+ // works, same as returning from window.onbeforeunload`
`203`	`203`	`event.returnValue = "There are unsaved changes. Leave now?";`
`204`	`204`	`});`
`205`	`205`	```

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