Fix browsing context creation steps (#737)

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Co-authored-by: Julian Descottes <[email protected]>

index.bs

@@ -193,6 +193,7 @@ spec: HTML; urlPrefix: https://html.spec.whatwg.org/multipage/
     text: context mode; url: /canvas.html#offscreencanvas-context-mode
     text: create a classic script; url: webappapis.html#creating-a-classic-script
     text: create a new browsing context; url: browsers.html#creating-a-new-browsing-context
+    text: create a new top-level traversable; url: document-sequences.html#creating-a-new-top-level-traversable
     text: default classic script fetch options; url: webappapis.html#default-classic-script-fetch-options
     text: default view; url: nav-history-apis.html#dom-document-defaultview
     text: descendant navigables; utl: document-sequences.html#descendant-navigables
@@ -229,7 +230,6 @@ spec: HTML; urlPrefix: https://html.spec.whatwg.org/multipage/
     text: traverse the history by a delta; url: browsing-the-web.html#traverse-the-history-by-a-delta
     text: update the file selection; url: input.html#update-the-file-selection
     text: visible; url: document-sequences.html#system-visibility-state
-    text: window open steps; url: window-object.html#window-open-steps
     text: worker event loop; url: webappapis.html#worker-event-loop-2
     text: worklet global scopes; url:worklets.html#concept-document-worklet-global-scopes
 spec: INFRA; urlPrefix: https://infra.spec.whatwg.org/
@@ -3184,13 +3184,10 @@ The [=remote end steps=] with |command parameters| are:
 
   <!-- This is based on step 5 of https://w3c.github.io/webdriver/#new-window,
        but without using the "current browsing context" concept. -->
-  1. Create a new [=top-level browsing context=] by running the [=window open
-     steps=] with <var ignore>url</var> set to "<code>about:blank</code>", <var
-     ignore>target</var> set to the empty string, and <var ignore>features</var>
-     set to "<code>noopener</code>", and setting the [=associated user context=]
-     for the newly created [=/top-level traversable=] to |user context|. Which OS
-     window the new [=/browsing context=] is created in depends on |type| and
-     |reference context|:
+  1. Create a new [=top-level browsing context=] by running
+     the [=/create a new top-level traversable=] steps with null and empty string,
+     and setting the [=associated user context=] for the newly created [=/top-level traversable=] to |user context|.
+     Which OS window the new [=/browsing context=] is created in depends on |type| and |reference context|:
 
      * If |type| is "<code>tab</code>" and the implementation supports
        multiple browsing contexts in the same OS window: