1 files changed, 8 insertions, 3 deletions
diff --git a/tests/wpt/web-platform-tests/secure-contexts/support/parent-shared-worker-script.js b/tests/wpt/web-platform-tests/secure-contexts/support/parent-shared-worker-script.js
index 7f999f93847..083564a0541 100644
--- a/tests/wpt/web-platform-tests/secure-contexts/support/parent-shared-worker-script.js
+++ b/tests/wpt/web-platform-tests/secure-contexts/support/parent-shared-worker-script.js
@@ -1,8 +1,13 @@
 addEventListener("connect", function (e) {
   var port = e.ports[0];
   port.start();
-  var w = new Worker("dedicated-worker-script.js");
-  w.onmessage = function (e) {
-    port.postMessage(e.data);
+  // If nested workers aren't supported, punt:
+  if (typeof Worker != "undefined") {
+    var w = new Worker("dedicated-worker-script.js");
+    w.onmessage = function (e) {
+      port.postMessage(e.data);
+    }
+  } else {
+    port.postMessage("Nested workers not supported.");
   }
 });