[jfk13]

The site should appear exactly the same in a fullscreen browser on a 27" desktop monitor, and on an original iPhone? That's rarely a useful goal.

For a page that really needs to look "exactly the same" everywhere it's viewed, maybe PDF is a better choice than HTML+CSS.

[sudosteph]

See my comment to the parent for an example of a site that needs to look the same (or rather - a portion of site - an HTML Canvas) that has to look the same on every device and which needs a specific font loaded to work properly. For my case, having a font that was guaranteed the same in every browser would have been very nice, and I would have gladly used that if it worked and fit the theme closely enough.