@annevk commented on this pull request.
> +        <p>
+          The <dfn>common safety checks</dfn> for a {{Document}}
+          |document:Document| are the following steps:
+        </p>
You should make these throw an exception. Web IDL will do the conversion from a thrown exception to a rejected promise. Returning an exception is very weird.
Alternatively you could return a(n) (string) enum and branch on that.
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