1 files changed, 42 insertions, 0 deletions
diff --git a/dom/tests/browser/browser_alert_from_about_blank.js b/dom/tests/browser/browser_alert_from_about_blank.js
new file mode 100644
index 0000000000..aa12dd1f7e
--- /dev/null
+++ b/dom/tests/browser/browser_alert_from_about_blank.js
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_check_alert_from_blank() {
+  await BrowserTestUtils.withNewTab(
+    "https://example.com/blank",
+    async browser => {
+      await SpecialPowers.spawn(browser, [], () => {
+        let button = content.document.createElement("button");
+        button.addEventListener("click", () => {
+          let newWin = content.open(
+            "about:blank",
+            "",
+            "popup,width=600,height=600"
+          );
+          newWin.alert("Alert from the popup.");
+        });
+        content.document.body.append(button);
+      });
+      let newWinPromise = BrowserTestUtils.waitForNewWindow();
+      await BrowserTestUtils.synthesizeMouseAtCenter("button", {}, browser);
+      let otherWin = await newWinPromise;
+      Assert.equal(
+        otherWin.gBrowser.currentURI?.spec,
+        "about:blank",
+        "Should have opened about:blank"
+      );
+      Assert.equal(
+        otherWin.menubar.visible,
+        false,
+        "Should be a popup window."
+      );
+      let contentDialogManager = gBrowser
+        .getTabDialogBox(gBrowser.selectedBrowser)
+        .getContentDialogManager();
+      todo_is(contentDialogManager._dialogs.length, 1, "Should have 1 dialog.");
+      await BrowserTestUtils.closeWindow(otherWin);
+    }
+  );
+});