webdriver: change Switch To Frame to raise invalid argument error for invalid types (#1387) (#1388)

Author: whimboo

index.html

@@ -191,7 +191,7 @@ <h2>Terminology</h2>
 as described by The Open Group Base Specifications Issue 7
 <a href=https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_15>section 4.15</a> (IEEE Std 1003.1).
 
-<p> 
+<p>
 An <dfn>integer</dfn> is a <a>Number</a> that is unchanged
 under the <a>ToInteger</a> operation.
 
@@ -3335,7 +3335,7 @@ <h3><dfn>Switch To Frame</dfn></h3>
  <li><p>If <var>id</var> is not <a>null</a>,
   a <code>Number</code> object,
   or an <a>Object</a> that <a>represents a web element</a>,
-  return <a>error</a> with <a>error code</a> <a>no such frame</a>.
+  return <a>error</a> with <a>error code</a> <a>invalid argument</a>.
 
  <li><p>If the <a>current browsing context</a> is <a>no longer open</a>,
   return <a>error</a> with <a>error code</a> <a>no such window</a>.