diff --git a/web-bundle/subresource-loading/subresource-loading-network-error.https.tentative.sub.html b/web-bundle/subresource-loading/subresource-loading-network-error.https.tentative.sub.html
new file mode 100644
index 00000000000000..23e71409b849fd
--- /dev/null
+++ b/web-bundle/subresource-loading/subresource-loading-network-error.https.tentative.sub.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<title>Web Bundle fetching failed due to a network error</title>
+<link rel="help" href="https://github.com/WICG/webpackage/blob/main/explainers/subresource-loading.md" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/test-helpers.js"></script>
+
+<body>
+  <!--
+       This test uses a non-existing WebBundle from a non-existent host, which makes
+       Web Bundle fetching fail due to a network error. The intent of is to chech if
+       failing to fetch a WebBundle also makes subresource fetch requests fail.
+  -->
+  <script>
+    promise_test(async () => {
+      const prefix =
+        "https://{{hosts[][nonexistent]}}/";
+      const resources = [
+        prefix + "resource.js",
+      ];
+      const link = await addLinkAndWaitForError(
+        prefix + "non-existing.wbn",
+        resources,
+        undefined
+      );
+
+      // Can not fetch a subresource because Web Bundle fetch failed.
+      await fetchAndWaitForReject(prefix + "resource.js");
+    }, "Subresource fetch requests for non-existing Web Bundle should fail.");
+  </script>
+</body>
diff --git a/web-bundle/subresource-loading/subresource-loading-webbundle-not-found.https.tentative.html b/web-bundle/subresource-loading/subresource-loading-webbundle-not-found.https.tentative.html
new file mode 100644
index 00000000000000..d54ffe095f17d6
--- /dev/null
+++ b/web-bundle/subresource-loading/subresource-loading-webbundle-not-found.https.tentative.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<title>Web Bundle fetching failed due to not found error</title>
+<link rel="help" href="https://github.com/WICG/webpackage/blob/main/explainers/subresource-loading.md" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/test-helpers.js"></script>
+
+<body>
+  <!--
+       This test uses a non-existing WebBundle,
+       https://web-platform.test:8444/web-bundle/resources/wbn/cors/non-existing.wbn.
+
+       The intent of this test is to check if failing to fetch a WebBundle due to not
+       found error also makes subresource fetch requests fail.
+  -->
+  <script>
+    promise_test(async () => {
+      const prefix =
+        "https://web-platform.test:8444/web-bundle/resources/wbn/";
+      const resources = [
+        prefix + "resource.js",
+      ];
+      const link = await addLinkAndWaitForError(
+        prefix + "non-existing.wbn",
+        resources,
+        undefined
+      );
+
+      // Can not fetch a subresource because Web Bundle fetch failed.
+      await fetchAndWaitForReject(prefix + "resource.js");
+    }, "Subresource fetch requests for non-existing Web Bundle should fail.");
+  </script>
+</body>
