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+<!doctype html>
+<meta charset=utf-8>
+<title></title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+
+// Tests that a {Dedicated,Shared}Worker keeps running even if its script
+// evaluation results in an abrupt completion. This corresponds to the "run a
+// worker" algorithm disregarding the return value of "run the {classic,module}
+// script" in its step 24:
+//
+// "If script is a classic script, then run the classic script script.
+// Otherwise, it is a module script; run the module script script."
+
+async function testWorker(worker) {
+ await new Promise(resolve => {
+ worker.onerror = e => {
+ assert_not_equals(e.message.search("uncaught-exception"), -1,
+ "Correct uncaught exception thrown by worker");
+
+ // Suppress the exception.
+ e.preventDefault();
+
+ resolve();
+ }
+ });
+
+ return new Promise(resolve => {
+ const channel = new MessageChannel();
+
+ channel.port1.onmessage = e => {
+ assert_equals(e.data, "handler-before-throw", "Correct message handler.");
+ resolve();
+ };
+
+ if (worker instanceof SharedWorker) {
+ worker.port.postMessage("", [channel.port2]);
+ } else {
+ worker.postMessage("", [channel.port2]);
+ }
+ });
+}
+
+promise_test(async t => {
+ const worker = new Worker("support/abrupt-completion.js");
+ return testWorker(worker);
+}, "DedicatedWorker should correctly handle abrupt completion");
+
+promise_test(async t => {
+ const worker = new SharedWorker("support/abrupt-completion.js");
+ return testWorker(worker);
+}, "SharedWorker should correctly handle abrupt completion");
+
+</script>