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diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.malformed-operations-with-promises.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.malformed-operations-with-promises.html
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+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.malformed-operations-with-promises.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas 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>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+
+<script>
+
+promise_test(async t => {
+  const canvas = document.createElement('canvas');
+  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.");
+
+promise_test(async t => {
+  const canvas = document.createElement('canvas');
+  const ctx = canvas.getContext('2d');
+
+  // Shouldn't throw on its own.
+  await new Promise(resolve => canvas.toBlob(resolve));
+  // Make sure the exception isn't caused by calling the function twice.
+  await new Promise(resolve => canvas.toBlob(resolve));
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  await promise_rejects_dom(t, 'InvalidStateError',
+                            new Promise(resolve => canvas.toBlob(resolve)));
+}, "Throws if toBlob is called while layers are open.");
+
+</script>
+</div>