Bug 91148 – [V8] Replaceable WebIDL attributes are broken

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: DOM

[Erik Arvidsson]

DOMWindow.idl has a bunch of [Replaceable] attributes. This means that the js property should be writable and setting the property should just replace the property.

The following shouldBe* both fails.

window.innerHeight = 42;
shouldBe('window.innerHeight', '42');
shouldBeTrue('Object.getOwnPropertyDescriptor(window, "innerHeight").writable)');

Once we implement bug 49739 the setter needs to defineProperty on the this object. Something like

{
  get: function() {
    return impl->innerHeight()
  },
  set: function(v) {
    Object.defineProperty({
      value: v,
      writable: true
      ...
  }
  ...
}

Right now we only have a get interceptor. I think we can get by using a set interceptor that calls ForceSet but it is possible that we also have to Delete the old property.

[Erik Arvidsson]

Sorry, this is only a problem with es5_readonly which we are trying to turn on.

[Erik Arvidsson]

*** This bug has been marked as a duplicate of bug 91668 ***