macOS WKWebView background transparency

Question

If someone has experience with WKWebView, please share how to make the background of the view transparent. The WebView object has such option via var drawsBackground: Bool { get set } but it is missing for the WKWebView class. I searched the net and .. found nothing. Before time it was possible to do so via opaque property, but not anymore. There is a getter isOpaque ... and that's it. I don't want to do it via CSS and already tried everything else, like:

webview.wantsLayer = true

webview.layer?.backgroundColor = NSColor.clear.cgColor

If someone can help ...

I. Nikolov

Answer 1

This should work for both macOS 10.11 and macOS 10.12:

if NSAppKitVersion.current.rawValue > 1500 {
    webView.setValue(false, forKey: "drawsBackground")
}
else {
    webView.setValue(true, forKey: "drawsTransparentBackground")
}

Remark: this has been passed by App Store review.