Using alt and down key to open datalist using keyboard

Source/core/html/forms/TextFieldInputType.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 188 matching lines @@
         return;
     }
     event->setDefaultHandled();
 }
 
 void TextFieldInputType::handleKeydownEventForSpinButton(KeyboardEvent* event)
 {
     if (element().isDisabledOrReadOnly())
         return;
     const String& key = event->keyIdentifier();
-    if (key == "Up")
+    if (key == "Up") {
         spinButtonStepUp();
-    else if (key == "Down")
+    } else if (key == "Down" && !event->altKey()) {
         spinButtonStepDown();
-    else
+    } else if (key == "Down" && event->altKey()) {
+        if (Chrome* chrome = this->chrome()) {
+            chrome->client().handleKeyboardEventOnTextField(element(), *event);

[keishi, 2014/04/02 08:38:01]

I think if we return early without calling event->setDefaultHandled(),
handleKeyboardEventOnTextField will be called from
NumberInputType::handleKeydownEvent.

+            return;
+        }
+    } else
         return;
     event->setDefaultHandled();
 }
 
 void TextFieldInputType::forwardEvent(Event* event)
 {
     if (SpinButtonElement* spinButton = spinButtonElement()) {
         spinButton->forwardEvent(event);
         if (event->defaultHandled())
             return;
@@ skipping 328 matching lines @@
 {
     return !element().isDisabledOrReadOnly();
 }
 
 bool TextFieldInputType::shouldSpinButtonRespondToWheelEvents()
 {
     return shouldSpinButtonRespondToMouseEvents() && element().focused();
 }
 
 } // namespace WebCore