1 files changed, 44 insertions, 0 deletions
diff --git a/docshell/test/mochitest/test_iframe_srcdoc_to_remote.html b/docshell/test/mochitest/test_iframe_srcdoc_to_remote.html
new file mode 100644
index 0000000000..05e0934d50
--- /dev/null
+++ b/docshell/test/mochitest/test_iframe_srcdoc_to_remote.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<head>
+  <meta charset="utf-8">
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css" />
+</head>
+
+<body onload="test()">
+    <script>
+        /*
+         Test to verify that when we change an OOP iframe to one that has a
+         srcdoc it loads in the correct process, which in this case is this
+         test document.
+         */
+        SimpleTest.waitForExplicitFinish();
+        async function test() {
+            // Create an OOP iframe
+            let frame = document.createElement("iframe");
+            await new Promise(r => {
+                frame.onload = r;
+                document.body.appendChild(frame);
+                // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+                frame.contentWindow.location = "http://example.net/tests/docshell/test/dummy_page.html";
+            });
+            if (SpecialPowers.useRemoteSubframes) {
+              ok(SpecialPowers.Cu.isRemoteProxy(frame.contentWindow), "should be a remote frame");
+            }
+
+            // Remove the attribute so we can set a srcdoc attribute on it
+            frame.removeAttribute("src");
+
+            // Set a srcdoc attribute on this iframe and wait for the load
+            await new Promise(r => {
+                frame.onload = r;
+                frame.setAttribute("srcdoc", '<html><body>body of the srcdoc frame</body></html>');
+            });
+
+            // We should be in the same process as this test document
+            ok(!SpecialPowers.Cu.isRemoteProxy(frame.contentWindow), "should NOT be a remote frame");
+            SimpleTest.finish();
+        }
+    </script>
+</body>
+