1 files changed, 34 insertions, 0 deletions
diff --git a/devtools/shared/commands/resource/tests/browser_resources_stylesheets_nested_iframes.js b/devtools/shared/commands/resource/tests/browser_resources_stylesheets_nested_iframes.js
new file mode 100644
index 0000000000..0b13f75ab9
--- /dev/null
+++ b/devtools/shared/commands/resource/tests/browser_resources_stylesheets_nested_iframes.js
@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that stylesheets are retrieved even if an iframe does not have a content document.
+
+const TEST_URI = URL_ROOT_SSL + "stylesheets-nested-iframes.html";
+
+add_task(async function () {
+  const tab = await addTab(TEST_URI);
+
+  const { client, resourceCommand, targetCommand } = await initResourceCommand(
+    tab
+  );
+
+  info("Check whether ResourceCommand gets existing stylesheet");
+  const availableResources = [];
+  await resourceCommand.watchResources([resourceCommand.TYPES.STYLESHEET], {
+    onAvailable: resources => availableResources.push(...resources),
+  });
+
+  // Bug 285395 limits the number of nested iframes to 10, and we have one stylesheet per document.
+  await waitFor(() => availableResources.length >= 10);
+
+  is(
+    availableResources.length,
+    10,
+    "Got the expected number of stylesheets, even with documentless iframes"
+  );
+
+  targetCommand.destroy();
+  await client.close();
+});