Advanced Swift: NSLayoutConstraints Programmatically in Swift 4 | Xcode 10
У вашего броузера проблема в совместимости с HTML5
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Documentation about Swift 4.2 available here:
https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html
Xcode 10 can be downloaded from this page:
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or you can download version directly from AppStore