This could be another case where it should be made virtual in C++ instead of using override in IDL, but given that the getter is anonymous (not named), I think that it's impossible to observe the existence of the getter from JavaScript. bashi@, can you confirm?

(With named getters, attributes and methods, one can use getOwnPropertyDescriptor on the prototype of the parent interface, and use that to run the parent interfaces's getters or methods on an instance of a derived interface which overrides the same thing. An odd little thing that makes these situations interesting.)

Sorry I missed this.

Yeah, it seems that the code generator doesn't check the existence of getters in parent interfaces. Maybe we need something similar to inherit_unforgeable_attributes()

https://cs.chromium.org/chromium/src/third_party/WebKit/Source/bindings/scripts/interface_dependency_resolver.py?q=inherit_unforgeable_attributes&l=319

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 Issue 752877  has been merged into this issue.