* Electron Version: 3.0.0-beta1
* Operating System (Platform and Version): macOS
* Last known working Electron version: 2.0.2

**Expected Behavior**
```css
html, body, * {
    -webkit-app-region: drag;
    -webkit-user-select: none;
    cursor: default;
}
```
should allow users to move the position of the window by dragging it directly.

**Actual behavior**
The window is not draggable.
The `cursor` and `-webkit-user-select` properties work well.

**To Reproduce**
copy the CSS above, paste it into a frameless app's `<style>` tag, and run the app.

**Screenshots**

**Additional Information**

atom/browser/api/atom_api_browser_window.cc
window_unresponsive_closure_.Cancel();
  Emit("responsive");
}
void BrowserWindow::RequestPreferredWidth(int* width) {
  *width = web_contents()->GetPreferredSize().width();
}
void BrowserWindow::OnCloseButtonClicked(bool* prevent_default) {
  
  
  
  *prevent_default = true;
  
  
  
  
  if (window_unresponsive_closure_.IsCancelled())
    ScheduleUnresponsiveEvent(5000);
  if (!web_contents())
    
    return;
  if (web_contents()->NeedToFireBeforeUnload())
    web_contents()->DispatchBeforeUnload();
  else
    web_contents()->Close();
}
void BrowserWindow::OnWindowClosed() {