[marshray]

One of the original, and continuing, uses of browser scripting is to tweak the layout based on client rendering quirks.

ISTR (late 1990's?) reading about fingerprinting attacks that didn't require script or even CSS. Subtle changes in font size and attributes (bold, italic) may affect the order in which page elements are requested by the browser.

Even if you wanted to, there's simply no reliable way to isolate data about client rendering from any other data exchanged with the server. Even if you did a heroic rearchitecture of the DOM and rendering system, there are still static IP addresses and cookies.

[blitmap]

I contend that while everything about the client cannot be hidden from the server, the number of things that can be identified is increasing.