1 files changed, 23 insertions, 0 deletions
diff --git a/dom/html/test/browser_DOMDocElementInserted.js b/dom/html/test/browser_DOMDocElementInserted.js
new file mode 100644
index 0000000000..fb2b2ae63b
--- /dev/null
+++ b/dom/html/test/browser_DOMDocElementInserted.js
@@ -0,0 +1,23 @@
+// Tests that the DOMDocElementInserted event is visible on the frame
+add_task(async function () {
+  let tab = BrowserTestUtils.addTab(gBrowser);
+  let uri = "data:text/html;charset=utf-8,<html/>";
+
+  let eventPromise = ContentTask.spawn(tab.linkedBrowser, null, function () {
+    return new Promise(resolve => {
+      addEventListener(
+        "DOMDocElementInserted",
+        event => resolve(event.target.documentURIObject.spec),
+        {
+          once: true,
+        }
+      );
+    });
+  });
+
+  BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, uri);
+  let loadedURI = await eventPromise;
+  is(loadedURI, uri, "Should have seen the event for the right URI");
+
+  gBrowser.removeTab(tab);
+});