1 files changed, 41 insertions, 0 deletions
diff --git a/dom/tests/browser/browser_cancel_keydown_keypress_event.js b/dom/tests/browser/browser_cancel_keydown_keypress_event.js
new file mode 100644
index 0000000000..de08aa17e9
--- /dev/null
+++ b/dom/tests/browser/browser_cancel_keydown_keypress_event.js
@@ -0,0 +1,41 @@
+const URL =
+  "https://example.com/browser/dom/tests/browser/prevent_return_key.html";
+
+const { PromptTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromptTestUtils.sys.mjs"
+);
+
+// Wait for alert dialog and dismiss it immediately.
+function awaitAndCloseAlertDialog(browser) {
+  return PromptTestUtils.handleNextPrompt(
+    browser,
+    { modalType: Services.prompt.MODAL_TYPE_CONTENT, promptType: "alert" },
+    { buttonNumClick: 0 }
+  );
+}
+
+add_task(async function () {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, URL);
+  let browser = tab.linkedBrowser;
+
+  // Focus and enter random text on input.
+  await SpecialPowers.spawn(browser, [], async function () {
+    let input = content.document.getElementById("input");
+    input.focus();
+    input.value = "abcd";
+  });
+
+  // Send return key (cross process) to submit the form implicitly.
+  let dialogShown = awaitAndCloseAlertDialog(browser);
+  EventUtils.synthesizeKey("KEY_Enter");
+  await dialogShown;
+
+  // Check that the form should not have been submitted.
+  await SpecialPowers.spawn(browser, [], async function () {
+    let result = content.document.getElementById("result").innerHTML;
+    info("submit result: " + result);
+    is(result, "not submitted", "form should not have submitted");
+  });
+
+  gBrowser.removeCurrentTab();
+});