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diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.malformed-operations-with-promises.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.malformed-operations-with-promises.html
new file mode 100644
index 0000000000..7b8f9b0943
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.malformed-operations-with-promises.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.layer.malformed-operations-with-promises</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<script>
+
+promise_test(async t => {
+  const canvas = new OffscreenCanvas(200, 200);
+  const ctx = canvas.getContext('2d');
+
+  // Shouldn't throw on its own.
+  await canvas.convertToBlob();
+  // Make sure the exception isn't caused by calling the function twice.
+  await canvas.convertToBlob();
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  await promise_rejects_dom(t, 'InvalidStateError',
+                            canvas.convertToBlob());
+}, "Throws if convertToBlob is called while layers are open.");
+
+promise_test(async t => {
+  const canvas = new OffscreenCanvas(200, 200);
+  const ctx = canvas.getContext('2d');
+
+  // Shouldn't throw on its own.
+  await createImageBitmap(canvas);
+  // Make sure the exception isn't caused by calling the function twice.
+  await createImageBitmap(canvas);
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  await promise_rejects_dom(t, 'InvalidStateError',
+                            createImageBitmap(canvas));
+}, "Throws if createImageBitmap is called while layers are open.");
+
+</script>