Re: [heycam/webidl] Define "implements" checks using internal slots (#595)

littledan commented on this pull request.



>  Every [=platform object=] is associated with a global environment, just
 as the [=initial objects=] are.
 It is the responsibility of specifications using Web IDL to state
 which global environment (or, by proxy, which global object) each platform
 object is associated with.
 
+<div algorithm>
+    To <dfn>create an object implementing the interface</dfn> |interface|, with optional
+    intenal slots |slots|, for an interface which is not declared with the
+    [{{Global}}] [=extended attribute=], perform the following steps:
+
+    1. If |slots| is provided, append \[[PrimaryInterface]] to |slots|.
+    1. Otherwise, let |slots| be &laquo; \[[PrimaryInterface]] &raquo;.
+    1. Let |proto| be the [=interface prototype object=] of |interface|.
+    1. Let |instance| be [$ObjectCreate$](|proto|, |slots|).

I guess it would be the operation of getting the interface prototype object that requires the realm. Not sure how to get people to pass in the realm, so i am inclined to stay vague for now (like the old spec was).

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