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Re:Asm.js: a strict subset of js for compilers – working draft by asadotzler on Saturday February 16, 2013 @02:43PM (#5232703)
Large parts of the Firefox browser (as distinct from the Gecko+SpiderMonkey) are written in JS. Have a look at the code some time. Or, just open chrome://browser/content/browser.xul in Firefox to get a taste.
Re:Asm.js: a strict subset of js for compilers – working draft by skatepark on Saturday February 16, 2013 @03:46PM (#5232955)
That's why I said "entire browser". Page rendering, font rendering, <canvas>, et al, are the interesting bits.

The use of XUL and the resulting UI clunkiness (speed, responsiveness, nativeness) are pretty well known.

A world in which only the vendor gets to write low-level code sounds is a terrible division of labor.