I know it's not exactly the same but the developer tools on all modern browsers will display the current state of the DOM in the "inspect" tab. It's true that SPAs will have a lot more clutter in the form of JavaScript hooks and hidden elements but it's all there in glorious <html/>. :)
I still have a soft spot for vanilla HTML. When I can hit view source and read the whole article (minus images) without much difficulty, I'm glad.