v154 · targetAddressSpace
Does this browser read it?
Because the option is a dictionary member, the answer is a fact rather than an inference: define it as a getter and see whether the constructor touches it. No connection, no permission prompt, no user agent string.
Probe the member
Running…
| member | read by the constructor? | notes |
|---|
Accepted values
| value | outcome | meaning |
|---|
The probe sockets are closed immediately. An invalid enum value should be a TypeError at construction — before any network activity — which is what makes a typo a bug you find rather than a permission you silently never get.