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

bzbarsky 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|).
+    1. Set |instance|.\[[PrimaryInterface]] to |interface|.
+    1. Let |realm| be the current [=Realm=].

> that won't make everyone pass it.

True, but that way we can work on fixing those places to pass it, or have some default convention for what Realm is used when calling this algorithm in various situations.

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