1 files changed, 35 insertions, 0 deletions
diff --git a/layout/xul/test/browser_bug1754298.js b/layout/xul/test/browser_bug1754298.js
new file mode 100644
index 0000000000..05701e4f08
--- /dev/null
+++ b/layout/xul/test/browser_bug1754298.js
@@ -0,0 +1,35 @@
+add_task(async function () {
+  const PAGE = `
+<!doctype html>
+<select>
+<option value="1">AA Option</option>
+<option value="2">BB Option</option>
+<option value="3">&nbsp;CC Option</option>
+<option value="4">&nbsp;&nbsp;DD Option</option>
+<option value="5">&nbsp;&nbsp;&nbsp;EE Option</option>
+</select>`;
+  const url = "data:text/html," + encodeURI(PAGE);
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url,
+    },
+    async function (browser) {
+      let popupShownPromise = BrowserTestUtils.waitForSelectPopupShown(window);
+      await BrowserTestUtils.synthesizeMouseAtCenter("select", {}, browser);
+      let popup = await popupShownPromise;
+      EventUtils.sendString("C", window);
+      EventUtils.sendKey("RETURN", window);
+      ok(
+        await TestUtils.waitForCondition(() => {
+          return SpecialPowers.spawn(
+            browser,
+            [],
+            () => content.document.querySelector("select").value
+          ).then(value => value == 3);
+        }),
+        "Unexpected value for select element (expected 3)!"
+      );
+    }
+  );
+});