diff --git a/e2etests/web/regular_integration_tests/test_driver/text_editing_integration.dart b/e2etests/web/regular_integration_tests/test_driver/text_editing_integration.dart
index 30acf5a3efb..49247d7d79c 100644
--- a/e2etests/web/regular_integration_tests/test_driver/text_editing_integration.dart
+++ b/e2etests/web/regular_integration_tests/test_driver/text_editing_integration.dart
@@ -179,6 +179,21 @@ void main() {
       'cancelable': true,
     });
 
+    // Press and release AltGr key.
+    // Regression test for https://github.com/flutter/flutter/issues/58979.
+    dispatchKeyboardEvent(input, 'keydown', <String, dynamic>{
+      'key': 'AltGraph',
+      'code': 'AltRight',
+      'bubbles': true,
+      'cancelable': true,
+    });
+    dispatchKeyboardEvent(input, 'keyup', <String, dynamic>{
+      'key': 'AltGraph',
+      'code': 'AltRight',
+      'bubbles': true,
+      'cancelable': true,
+    });
+
     // Press Tab. The focus should move to the next TextFormField.
     dispatchKeyboardEvent(input, 'keydown', <String, dynamic>{
       'key': 'Tab',
diff --git a/lib/web_ui/lib/src/engine/keyboard.dart b/lib/web_ui/lib/src/engine/keyboard.dart
index 558e53f6f92..c15886bd6b1 100644
--- a/lib/web_ui/lib/src/engine/keyboard.dart
+++ b/lib/web_ui/lib/src/engine/keyboard.dart
@@ -177,7 +177,7 @@ int _getMetaState(html.KeyboardEvent event) {
   if (event.getModifierState('Shift')) {
     metaState |= _modifierShift;
   }
-  if (event.getModifierState('Alt')) {
+  if (event.getModifierState('Alt') || event.getModifierState('AltGraph')) {
     metaState |= _modifierAlt;
   }
   if (event.getModifierState('Control')) {