Le 24/12/2012 10:48, Anne van Kesteren a écrit :
I thought I'd give a heads up as over on www-...@w3.org we're
discussing two cases where we likely need to change the prototype
chain of objects: document.open() and methods that do the equivalent
of document.adoptNode() (including that method itself):
http://lists.w3.org/Archives/Public/www-dom/2012OctDec/thread.html#msg143
Thanks for the heads up!
It seems ES6 has __proto__ which also allows modifying [[Prototype]]
so presumably this is nothing particularly bad, although it is very
ugly :-(
The ability to change the [[Prototype]] of an object is orthogonal to
the __proto__ problem. If it's necessary for DOM objects to change the
[[Prototype]] for backward-compat or security reasons, it can do so, I
guess. __proto__ is about author being allowed to change the [[Prototype]].
One thing to keep in mind, under no circomstances an object with
[[Extensible]]:false can have its [[Prototype]] changed. The solution is
either to forbid the change to [[Extensible]]:false (by throwing when
about to) or forbid changing the [[Prototype]].
David
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