How to change frame like using CGAffineTransform?

I have WebView, which I want to change his size. I use CGAffineTransform looks like -

let transform: CGAffineTransform = .init(scaleX: 0.2, y: 0.2)
UIView.animate(withDuration: 0.5) {
    webView.transform = transform
}

Then I get result:

When I use webView.frame = CGRect(...), I got result:

How to get result like CGAffineTransform, when I use frame?