docs: recommend setting e.returnValue (#33628)
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					@ -473,7 +473,7 @@ window.onbeforeunload = (e) => {
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  // a non-void value will silently cancel the close.
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					  // a non-void value will silently cancel the close.
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  // It is recommended to use the dialog API to let the user confirm closing the
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					  // It is recommended to use the dialog API to let the user confirm closing the
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  // application.
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					  // application.
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  e.returnValue = false // equivalent to `return false` but not recommended
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					  e.returnValue = false
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}
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					}
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```
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					```
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