or semantic

index.bs

@@ -9790,14 +9790,7 @@ The [=remote end steps=] given |session| and |command parameters| are:
 1. Let |arguments| be the <code>arguments</code> field of |command
    parameters| if present, or an empty [=/list=] otherwise.
 
-1. Let |user contexts| be [=set/create|create a set=] with |command parameters|["<code>userContexts</code>"]
-   if |command parameters| [=map/contains=] <code>userContexts</code> and an empty [=/set=] otherwise.
-
-1. For each |user context id| of |user contexts|:
-
-   1. Set |user context| to [=get user context=] with |user context id|.
-
-   1. If |user context| is null, return [=error=] with [=error code=] [=no such user context=].
+1. Let |user contexts| to be a [=/set=].
 
 1. Let |navigables| be null.
 
@@ -9813,6 +9806,16 @@ The [=remote end steps=] given |session| and |command parameters| are:
 
       1. Append |navigable| to |navigables|.
 
+1. Otherwise, if |command parameters| [=map/contains=] <code>userContexts</code>:
+
+  1. Set |user contexts| to [=set/create|create a set=] with |command parameters|["<code>userContexts</code>"].
+
+  1. For each |user context id| of |user contexts|:
+
+    1. Set |user context| to [=get user context=] with |user context id|.
+
+    1. If |user context| is null, return [=error=] with [=error code=] [=no such user context=].
+
 1. Let |sandbox| be the value of the "<code>sandbox</code>" field in |command
    parameters|, if present, or null otherwise.