WPF Textblock Run glyphFontSize TextDecorations

<Window x:Class="WpfApp412.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp412"
        mc:Ignorable="d"
        WindowState="Maximized"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <Style TargetType="{x:Type TextBlock}">
            <Setter Property="FontSize" Value="100"/>
        </Style>
    </Window.Resources>
    <StackPanel>
        <TextBlock>
            <Run FontStyle="Italic" FontFamily="Georgia" Foreground="Red">
                Rich
            </Run>
        </TextBlock>
        <TextBlock>
            
        <Run FontSize="30" FontFamily="Comic Sans MS" Foreground="Blue">Text</Run>
        </TextBlock>
        <TextBlock>            
        <Run FontFamily="Arial Black" Foreground="Orange" FontSize="100">in</Run>
        </TextBlock>
        <TextBlock>            
        <Run FontFamily="Courier New" FontWeight="Bold" Foreground="Green"> a</Run>
        </TextBlock>
        <TextBlock>
            <Run FontFamily="Verdana" TextDecorations="Underline">TextBlock</Run>
        </TextBlock>
    </StackPanel>
</Window>