1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/instantiation-error-3.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/instantiation-error-3.html
new file mode 100644
index 0000000000..32f0a4a243
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/instantiation-error-3.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<title>Handling of instantiation errors, 3</title>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+    setup({allow_uncaught_exception: true});
+
+    const test_load = async_test(
+        "Test that unresolvable cycles lead to SyntaxError events on window " +
+        "and load events on script");
+
+    window.log = [];
+    window.addEventListener("error", ev => {
+      test_load.step(() => assert_equals(ev.error.constructor, SyntaxError));
+      log.push(ev.message);
+    });
+
+    window.addEventListener("load", test_load.step_func_done(ev => {
+      assert_equals(log.length, 6, 'Log length');
+      assert_equals(log[1], 1);
+      assert_equals(log[3], 2);
+      assert_equals(log[5], 3);
+      assert_not_equals(log[0], log[2],
+        'Instantiation error objects for different root scripts');
+      assert_equals(log[0], log[4],
+        'Instantiation error objects for the same root script');
+    }));
+
+    function unreachable() { log.push("unexpected"); }
+</script>
+<script type="module" src="./cycle-unresolvable.js"
+    onerror="unreachable()" onload="log.push(1)" nomodule></script>
+<script type="module" src="./cycle-unresolvable-a.js"
+    onerror="unreachable()" onload="log.push(2)"></script>
+<script type="module" src="./cycle-unresolvable.js"
+    onerror="unreachable()" onload="log.push(3)"></script>