1 files changed, 22 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/import-assertions/unsupported-assertion.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/import-assertions/unsupported-assertion.html
new file mode 100644
index 0000000000..72977347a7
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/import-assertions/unsupported-assertion.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>Handling of unsupported assertion</title>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+    setup({allow_uncaught_exception: true});
+
+    window.log = [];
+
+    window.addEventListener("error", ev => log.push(ev.error));
+
+    const test_load = async_test(
+        "Test that invalid module assertion leads to SyntaxError on window.");
+    window.addEventListener("load", test_load.step_func_done(ev => {
+      assert_equals(log.length, 1);
+      assert_equals(log[0].constructor, SyntaxError);
+    }));
+
+    function unreachable() { log.push("unexpected"); }
+</script>
+<script type="module" src="./unsupported-assertion.js" onerror="unreachable()"></script>