WPF C#

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Animation Speed Example" Height="240" Width="410">
    
          Height="20" HorizontalAlignment="Left" />
          Content="Start Animations" Width="100">
      
        
          
            
              
                                  Storyboard.TargetName="rect5" Storyboard.TargetProperty="Width"
                  From="20" To="400" Duration="0:0:10" DecelerationRatio="0.5" />