convert switch steps to colon-denotation

index.bs

@@ -709,23 +709,20 @@ When this method is invoked, the user agent MUST execute the following algorithm
     responses from the authenticators:
     <dl class="switch">
 
-    <dt>If the |adjustedTimeout| timer expires,</dt>
-    <dd>[=set/For each=] |authenticator| in |issuedRequests| invoke the [=authenticatorCancel=] operation on |authenticator|
+    :   If the |adjustedTimeout| timer expires,
+    ::  [=set/For each=] |authenticator| in |issuedRequests| invoke the [=authenticatorCancel=] operation on |authenticator|
         and [=set/remove=] |authenticator| from |issuedRequests|.</dd>
 
-    <dt>If any |authenticator| returns a status indicating that the user cancelled the operation,</dt>
-    <dd>
-        1. [=set/Remove=] |authenticator| from |issuedRequests|.
+    :   If any |authenticator| returns a status indicating that the user cancelled the operation,</dt>
+    ::  1. [=set/Remove=] |authenticator| from |issuedRequests|.
         2. [=set/For each=] remaining |authenticator| in |issuedRequests| invoke the [=authenticatorCancel=] operation on
             |authenticator| and [=set/remove=] it from |issuedRequests|.
-    </dd>
 
-    <dt>If any |authenticator| returns an error status,</dt>
-    <dd>[=set/Remove=] |authenticator| from |issuedRequests|.</dd>
+    :   If any |authenticator| returns an error status,
+    ::  [=set/Remove=] |authenticator| from |issuedRequests|.</dd>
 
-    <dt>If any |authenticator| indicates success,</dt>
-    <dd>
-        1.  [=set/Remove=] |authenticator| from |issuedRequests|.
+    :   If any |authenticator| indicates success,
+    ::  1.  [=set/Remove=] |authenticator| from |issuedRequests|.
         2.  Let |attestationObject| be a new {{ArrayBuffer}}, created using |global|'s [=%ArrayBuffer%=], containing the
             bytes of the value returned from the successful [=authenticatorMakeCredential=] operation (which is
             <code>attObj</code>, as defined in [[#generating-an-attestation-object]]).
@@ -748,7 +745,7 @@ When this method is invoked, the user agent MUST execute the following algorithm
         5. [=set/For each=] remaining |authenticator| in |issuedRequests| invoke the [=authenticatorCancel=] operation on
             |authenticator| and [=set/remove=] it from |issuedRequests|.
         6. Return |value| and terminate this algorithm.
-    </dd>
+
     </dl>
 
 1. Return a {{DOMException}} whose name is "{{NotAllowedError}}".