1 files changed, 50 insertions, 0 deletions
diff --git a/devtools/client/inspector/test/browser_inspector_reload_nested_iframe.js b/devtools/client/inspector/test/browser_inspector_reload_nested_iframe.js
new file mode 100644
index 0000000000..46486996e3
--- /dev/null
+++ b/devtools/client/inspector/test/browser_inspector_reload_nested_iframe.js
@@ -0,0 +1,50 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+// Check that the markup view selection is preserved even if the selection is
+// in a nested iframe.
+
+const NESTED_IFRAME_URL = `https://example.com/document-builder.sjs?html=${encodeURIComponent(
+  "<h3>second level iframe</h3>"
+)}&delay=500`;
+
+const TEST_URI = `data:text/html;charset=utf-8,
+  <h1>Top-level</h1>
+  <iframe id=first-level
+    src='data:text/html;charset=utf-8,${encodeURIComponent(
+      `<h2>first level iframe</h2><iframe id=second-level src="${NESTED_IFRAME_URL}"></iframe>`
+    )}'
+  ></iframe>`;
+
+add_task(async function () {
+  const { inspector } = await openInspectorForURL(TEST_URI);
+
+  await selectNodeInFrames(
+    ["iframe#first-level", "iframe#second-level", "h3"],
+    inspector
+  );
+
+  const markupLoaded = inspector.once("markuploaded");
+
+  info("Reloading page.");
+  await navigateTo(TEST_URI);
+
+  info("Waiting for markupview to load after reload.");
+  await markupLoaded;
+
+  // This was broken at some point, see Bug 1733539.
+  ok(true, "The markup did reload fine");
+
+  const reloadedNodeFront = await getNodeFrontInFrames(
+    ["iframe#first-level", "iframe#second-level", "h3"],
+    inspector
+  );
+
+  is(
+    inspector.selection.nodeFront,
+    reloadedNodeFront,
+    `h3 selected after reload`
+  );
+});