In this answer, the author proclaims:
Since WPF uses the WebBrowser control under the hood, this should work for the Frame control as well.
However, this doesn't make a lot of sense to me if the Frame is hosting a WPF page (obviously it's using a WebBrowser for web content). Does the Frame attempt to emulate a WebBrowser when it's hosting a Page, or does it actually somehow turn the Page into HTML, etc, then host it in a WebBrowser?