Fix build by referencing css22 instead of css2 (#816)

index.bs

@@ -2980,6 +2980,9 @@ browsingContext.CssLocator = {
 
 browsingContext.ContainerLocator = {
   type: "container",
+  value: {
+    context: text,
+  }
 }
 
 browsingContext.InnerTextLocator = {
@@ -4063,9 +4066,14 @@ The [=remote end steps=] with |session| and |command parameters| are:
       <dt>|type| is the string "<code>container</code>"
       <dd>
 
-         1. Issue: throw errors if extra unused optional params are set?
+         1. If |start nodes parameter| is not null,
+            return [=error=] with [=error code=] "<code>invalid argument</code>".
 
-         1. Let |result nodes| be [=locate the container element=] given |navigable|.
+         1. Let |selector| be |locator|["<code>value</code>"].
+
+         1. Let |child navigable| be |selector|["<code>context</code>"].
+
+         1. Let |result nodes| be [=locate the container element=] given |child navigable|.
 
 1. Assert: |maximum returned node count| is null or [=list/size=] of |result nodes| is less
    than or equal to |maximum returned node count|.