1 files changed, 28 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/inline-async-onload.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/inline-async-onload.html
new file mode 100644
index 0000000000..314abc98dc
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/inline-async-onload.html
@@ -0,0 +1,28 @@
+<html>
+  <head>
+    <title>Inline async module script without external deps onload blocking</title>
+    <meta name=timeout content=long>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      let loadFired = false;
+      let moduleRan = false
+      let test = async_test("Inline async module script vs. onload");
+      window.addEventListener("load", test.step_func(function() {
+        loadFired = true;
+        assert_true(moduleRan, "Module should have run before the load event");
+        test.step_timeout(function() {
+          test.done();
+        }, 0);
+      }));
+    </script>
+    <script type="module" async>
+      moduleRan = true;
+      test.step_func(function() {
+        assert_false(loadFired, "onload should not have fired yet");
+      });
+    </script>
+  </body>
+</html>