Status: Accepted
Owner: ----
CC: [email protected], [email protected], [email protected],
[email protected], [email protected]
Labels: Type-Bug Priority-Medium
New issue 3538 by [email protected]: DOM attributes on prototype chains
throw a TypeError when it shouldn't be thrown
https://code.google.com/p/v8/issues/detail?id=3538
I'm trying to move most DOM attributes to prototype chains
(https://codereview.chromium.org/447523003/). It's working in almost all
cases, but it breaks a couple of tests in a very strange way.
I minimized the test cases here:
https://codereview.chromium.org/502333003
Specifically, if I move HTMLCollection.children to a prototype chain, the
following code throws a TypeError:
e = document.createElement("div");
console.log(e.children.item(0)); // This does not throw.
console.log(e.children.length); // This throws a TypeError.
Note that DOM methods are already defined on prototype chains. They don't
throw. This behavior is correct. On the other hand, a couple of DOM
attributes throws a TypeError when moved to prototype chains.
This happens only in a very small number of DOM attributes. I cannot find
any difference in the binding side between DOM attributes that don't throw
and DOM attributes that throw TypeErrors. So I'm suspecting that it might
be a bug of V8, but would anyone take a look at it?
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