An iFrames is like a window to another URL.
So anything that lives on a url can be embedded using an iframe (Unless the owner of the page has some code preventing it from displaying on another website - Which is not the case here as this is the whole point)

To test if Wix supports iFrames
Add this to a page in Wix

<iframe src="https://www.google.com" width="300" height="300" frameborder="0"></iframe>