Not Support MarkAsUndetectable API？

[RuntimeBroker]

For example v8::ObjectTemplate::MarkAsUndetectable

[0f-0b]

Are you implementing a web browser? The JS specification has this to say about “undetectable” objects:

There are no other known examples of this type of object and implementations should not create any with the exception of document.all.

[RuntimeBroker]

sure I'm implementing a web browser,I must ensure consistency.