diff --git a/testing/web-platform/tests/close-watcher/basic.html b/testing/web-platform/tests/close-watcher/basic.html
index 79a91e127ef68..1b09263055964 100644
--- a/testing/web-platform/tests/close-watcher/basic.html
+++ b/testing/web-platform/tests/close-watcher/basic.html
@@ -14,7 +14,7 @@
 
   watcher.requestClose();
 
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);
 }, "requestClose() with no user activation");
 
 test(t => {
@@ -43,10 +43,10 @@
   let watcher = createRecordingCloseWatcher(t, events);
 
   watcher.requestClose();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);
 
   watcher.destroy();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);
 }, "requestClose() then destroy()");
 
 test(t => {
diff --git a/testing/web-platform/tests/close-watcher/inside-event-listeners.html b/testing/web-platform/tests/close-watcher/inside-event-listeners.html
index 47f431e250367..93996fb5fee32 100644
--- a/testing/web-platform/tests/close-watcher/inside-event-listeners.html
+++ b/testing/web-platform/tests/close-watcher/inside-event-listeners.html
@@ -30,10 +30,10 @@
   watcher.onclose = () => { watcher.destroy(); }
 
   watcher.requestClose();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);
 
   watcher.requestClose();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"], "since it was inactive, no more events fired");
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"], "since it was inactive, no more events fired");
 }, "destroy() inside onclose");
 
 promise_test(async t => {
@@ -58,10 +58,10 @@
   watcher.onclose = () => { watcher.close(); }
 
   watcher.requestClose();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);
 
   watcher.requestClose();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"], "since it was inactive, no more events fired");
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"], "since it was inactive, no more events fired");
 }, "close() inside onclose");
 
 promise_test(async t => {
@@ -86,9 +86,9 @@
   watcher.onclose = () => { watcher.requestClose(); }
 
   watcher.requestClose();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);
 
   watcher.requestClose();
-  assert_array_equals(events, ["cancel[cancelable=false]", "close"], "since it was inactive, no more events fired");
+  assert_array_equals(events, ["cancel[cancelable=true]", "close"], "since it was inactive, no more events fired");
 }, "requestClose() inside onclose");
 </script>