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I have a String extension function which converts an html string to a NSAttributed string, and it's made up with Swift 3.x. The strings I'm showing in a UILabel consists of different html-tags, like <i>, <b>, and <center>.Using Xcode 9.0.1 and deploying the app with the code onto an iPhone running iOS 10 it's working perfectly.Same app, but deployed to an iPhone running iOS 11, all html-tags are converted - except the <b>.Here's the code: func htmlAttributedString(fontSize: CGFloat = 17.0) -> NSAttributedString? { let fontName = UIFont.systemFont(ofSize: fontSize).fontName let string = self.appending(String(format: "<style>body{font-family: '%@'; font-size:%fpx;}</style>", fontName, fontSize)) guard let data = string.data(using: String.Encoding.utf16, allowLossyConversion: false) else { return nil } guard let attributedString = try? NSMutableAttributedString(data: data, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil) else { return nil } print("\(String(describing: self)):\(#function): attributedString: \(attributedString)") return attributedString }By looking at the attributedString output to the console, I can see that on the iPhone with iOS 10 the attributed string contains .SFUIText, .SFUIText-Italic, and .SFUIText-BoldItalic as it should, but running iOS 11 the .SFUIText-BoldItalic is missing.Have any one else experienced the same issue, and maybe has come up with a solution?//Mellberg