On second thought, what's the difference between prollyfills and libraries 
exposed web APIs in a functional style (e.g., node1._replaceWith(node2) vs 
replaceWith(node2, node1)? Or in a wrapper style like jquery does? Prefixing 
APIs doesn't seem to be that different from using custom APIs? You might say 
the prefixing approach resembles native APIs more closely, but when changing 
your code to use native APIs, modifying one character or several doesn't really 
make much difference (they are the same if you find & replace), as long as you 
have to modify the code.

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