diff --git a/websockets/binary/002.html b/websockets/binary/002.html
index 2e47a88d76c55d..313f6d219c0ae2 100644
--- a/websockets/binary/002.html
+++ b/websockets/binary/002.html
@@ -23,5 +23,5 @@
     t.done();
   });
 
-}, null);
+});
 </script>
diff --git a/websockets/binary/004.html b/websockets/binary/004.html
index ec787422a042dc..2c4e46a2d380dc 100644
--- a/websockets/binary/004.html
+++ b/websockets/binary/004.html
@@ -22,5 +22,5 @@
     t.done();
   })
 
-}, null);
+});
 </script>
diff --git a/websockets/constructor/013.html b/websockets/constructor/013.html
index ea732a7abd8796..a581bc15131302 100644
--- a/websockets/constructor/013.html
+++ b/websockets/constructor/013.html
@@ -36,6 +36,6 @@
     }, ws[i]);
     ws[i].onerror = t.step_func(function() {assert_unreached()});
   }
-}, null);
+});
 </script>
 
diff --git a/websockets/cookies/003.html b/websockets/cookies/003.html
index 25259119612052..219f05f193af60 100644
--- a/websockets/cookies/003.html
+++ b/websockets/cookies/003.html
@@ -29,5 +29,5 @@
     ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
   });
   document.body.appendChild(iframe);
-}, null);
+});
 </script>
diff --git a/websockets/cookies/004.html b/websockets/cookies/004.html
index 6d4c49a6f1af2f..b4d05fbec13e5c 100644
--- a/websockets/cookies/004.html
+++ b/websockets/cookies/004.html
@@ -27,5 +27,5 @@
   });
   ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
   document.body.appendChild(iframe);
-}, null)
+});
 </script>
diff --git a/websockets/cookies/007.html b/websockets/cookies/007.html
index 0431b6508deb44..b1654f5b3cadf5 100644
--- a/websockets/cookies/007.html
+++ b/websockets/cookies/007.html
@@ -31,5 +31,5 @@
   if (new RegExp('ws_test_'+cookie_id+'=test').test(document.cookie)) {
     assert_unreached('cookie was set during script execution');
   }
-}, null);
+});
 </script>
diff --git a/websockets/interfaces/CloseEvent/clean-close.html b/websockets/interfaces/CloseEvent/clean-close.html
index 4e8f5b8c439b9c..ad22107287a070 100644
--- a/websockets/interfaces/CloseEvent/clean-close.html
+++ b/websockets/interfaces/CloseEvent/clean-close.html
@@ -19,5 +19,5 @@
     assert_equals(e.wasClean,true);
     t.done();
   });
-}, null);
+});
 </script>
diff --git a/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-large.html b/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-large.html
index 6828c2bd10e7c1..c9f15b082c79b4 100644
--- a/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-large.html
+++ b/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-large.html
@@ -23,5 +23,5 @@
     assert_equals(e.data, data);
     t.done();
   })
-}, null);
+});
 </script>
diff --git a/websockets/interfaces/WebSocket/close/close-basic.html b/websockets/interfaces/WebSocket/close/close-basic.html
index 08e496d7b6185e..673f730cfaee08 100644
--- a/websockets/interfaces/WebSocket/close/close-basic.html
+++ b/websockets/interfaces/WebSocket/close/close-basic.html
@@ -22,5 +22,5 @@
   });
   ws.close();
   assert_equals(ws.readyState, ws.CLOSING);
-}, undefined);
+});
 </script>
diff --git a/websockets/interfaces/WebSocket/close/close-connecting.html b/websockets/interfaces/WebSocket/close/close-connecting.html
index be858fc413edcd..3e9e51b319e527 100644
--- a/websockets/interfaces/WebSocket/close/close-connecting.html
+++ b/websockets/interfaces/WebSocket/close/close-connecting.html
@@ -21,5 +21,5 @@
     });
   }, 1000);
   ws.onopen = ws.onclose = t.unreached_func();
-}, undefined);
+});
 </script>
diff --git a/websockets/interfaces/WebSocket/close/close-nested.html b/websockets/interfaces/WebSocket/close/close-nested.html
index be993db1dd32af..3ba99af966f407 100644
--- a/websockets/interfaces/WebSocket/close/close-nested.html
+++ b/websockets/interfaces/WebSocket/close/close-nested.html
@@ -24,5 +24,5 @@
   });
   ws.close();
   assert_equals(ws.readyState, ws.CLOSING);
-}, undefined);
+});
 </script>
diff --git a/websockets/interfaces/WebSocket/events/003.html b/websockets/interfaces/WebSocket/events/003.html
index 6c348bf1e8411f..430ea14f6775be 100644
--- a/websockets/interfaces/WebSocket/events/003.html
+++ b/websockets/interfaces/WebSocket/events/003.html
@@ -17,5 +17,5 @@
   var ev = document.createEvent('UIEvents');
   ev.initUIEvent('open', false, false, window, 5);
   ws.dispatchEvent(ev);
-}, null);
+});
 </script>
diff --git a/websockets/interfaces/WebSocket/events/007.html b/websockets/interfaces/WebSocket/events/007.html
index 67c1ebd17fce42..1e4f2361c5a08f 100644
--- a/websockets/interfaces/WebSocket/events/007.html
+++ b/websockets/interfaces/WebSocket/events/007.html
@@ -17,5 +17,5 @@
   var ev = document.createEvent('UIEvents');
   ev.initUIEvent('message', false, false, window, 5);
   ws.dispatchEvent(ev);
-}, null);
+});
 </script>
diff --git a/websockets/interfaces/WebSocket/events/009.html b/websockets/interfaces/WebSocket/events/009.html
index 38f1f573f82398..58df1d618172b9 100644
--- a/websockets/interfaces/WebSocket/events/009.html
+++ b/websockets/interfaces/WebSocket/events/009.html
@@ -17,5 +17,5 @@
   var ev = document.createEvent('UIEvents');
   ev.initUIEvent('close', false, false, window, 5);
   ws.dispatchEvent(ev);
-}, null);
+});
 </script>
diff --git a/websockets/keeping-connection-open/001.html b/websockets/keeping-connection-open/001.html
index 4c5e717a423e76..f6d77a65ee8e60 100644
--- a/websockets/keeping-connection-open/001.html
+++ b/websockets/keeping-connection-open/001.html
@@ -24,5 +24,5 @@
       });
     }, 20000);
   })
-}, null);
+});
 </script>
diff --git a/websockets/opening-handshake/001.html b/websockets/opening-handshake/001.html
index 61cef5c3a9b4ce..e0e9b4e2eab47e 100644
--- a/websockets/opening-handshake/001.html
+++ b/websockets/opening-handshake/001.html
@@ -15,5 +15,5 @@
     t.step_timeout(() => t.done(), 50);
   });
    ws.onmessage = ws.onopen = t.unreached_func();
-}, null);
+});
 </script>
diff --git a/websockets/opening-handshake/002.html b/websockets/opening-handshake/002.html
index 9ada29dd4f8f82..95139e199eb9dc 100644
--- a/websockets/opening-handshake/002.html
+++ b/websockets/opening-handshake/002.html
@@ -19,5 +19,5 @@
     ws.close();
   });
   ws.onerror = ws.onmessage = ws.onclose = t.unreached_func();
-}, null);
+});
 </script>
diff --git a/websockets/unload-a-document/002.html b/websockets/unload-a-document/002.html
index e847dc5161ab58..94028e70386313 100644
--- a/websockets/unload-a-document/002.html
+++ b/websockets/unload-a-document/002.html
@@ -10,7 +10,7 @@
 <p>Test requires popup blocker disabled</p>
 <div id=log></div>
 <script>
-var t = async_test(null);
+var t = async_test();
 var w;
 var uuid;
 t.step(function() {
diff --git a/websockets/unload-a-document/004.html b/websockets/unload-a-document/004.html
index 79f5ca818707d0..bb15cd8ef9244a 100644
--- a/websockets/unload-a-document/004.html
+++ b/websockets/unload-a-document/004.html
@@ -7,7 +7,7 @@
 <div id=log></div>
 <script>
 var uuid;
-var t = async_test(null)
+var t = async_test();
 t.step(function() {uuid = token()});
 var navigate = t.step_func(function() {
   document.getElementsByTagName("iframe")[0].src = 'data:text/html,<body onload="history.back()">';
diff --git a/websockets/unload-a-document/005.html b/websockets/unload-a-document/005.html
index ad64f2797d41a2..81a05f48ead2de 100644
--- a/websockets/unload-a-document/005.html
+++ b/websockets/unload-a-document/005.html
@@ -10,7 +10,7 @@
 <p>Test requires popup blocker disabled</p>
 <div id=log></div>
 <script>
-var t = async_test(null);
+var t = async_test();
 t.step(function() {
   var w = window.open("005-1.html");
   add_result_callback(function() {