Avalonia/samples/ControlCatalog/Pages/TextBlockPage.xaml

<UserControl x:Class="ControlCatalog.Pages.TextBlockPage"
             xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel>
    <TextBlock Classes="h2">A control that can display text</TextBlock>
    <WrapPanel MaxWidth="680"
               Margin="-10,0"
               HorizontalAlignment="Center">
      <WrapPanel.Styles>
        <Style Selector="Border">
          <Setter Property="BorderThickness" Value="1" />
          <Setter Property="BorderBrush" Value="{DynamicResource CatalogBaseMediumColor}" />
          <Setter Property="Padding" Value="2" />
          <Setter Property="Margin" Value="10" />
          <Setter Property="Width" Value="200" />
        </Style>
      </WrapPanel.Styles>
      <Border>
        <StackPanel Spacing="8">
          <TextBlock Margin="0,0,10,0"
                     Text="Lorem ipsum dolor sit amet, consectetur adipiscing elit."
                     TextTrimming="CharacterEllipsis" />
          <TextBlock Margin="0,0,10,0"
                     Text="Lorem ipsum dolor sit amet, consectetur adipiscing elit."
                     TextTrimming="WordEllipsis" />
          <TextBlock Text="Left aligned text" TextAlignment="Left" />
          <TextBlock Text="Center aligned text" TextAlignment="Center" />
          <TextBlock Text="Right aligned text" TextAlignment="Right" />
        </StackPanel>
      </Border>
      <Border>
        <StackPanel Spacing="8">
          <TextBlock Text="Multiline TextBlock with TextWrapping.&#xD;&#xD;Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est." TextWrapping="Wrap" />
        </StackPanel>
      </Border>
      <Border>
        <StackPanel Spacing="8">
          <TextBlock FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"
                     FontStyle="Normal"
                     FontWeight="Normal"
                     Text="Custom font regular" />
          <TextBlock FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"
                     FontStyle="Normal"
                     FontWeight="Bold"
                     Text="Custom font bold" />
          <TextBlock FontFamily="/Assets/Fonts/SourceSansPro-Italic.ttf#Source Sans Pro"
                     FontStyle="Italic"
                     FontWeight="Normal"
                     Text="Custom font italic" />
          <TextBlock FontFamily="/Assets/Fonts/SourceSansPro-*.ttf#Source Sans Pro"
                     FontStyle="Italic"
                     FontWeight="Bold"
                     Text="Custom font italic bold" />
        </StackPanel>
      </Border>
      <Border>
        <StackPanel Spacing="8">
          <TextBlock Text="Underline" TextDecorations="Underline" />
          <TextBlock Text="Strikethrough" TextDecorations="Strikethrough" />
          <TextBlock Text="Overline" TextDecorations="Overline" />
          <TextBlock Text="Baseline" TextDecorations="Baseline" />
          <TextBlock Text="Custom TextDecorations">
            <TextBlock.TextDecorations>
              <TextDecorationCollection>
                <TextDecoration Location="Overline"
                                StrokeThickness="2"
                                StrokeThicknessUnit="Pixel">
                  <TextDecoration.Stroke>
                    <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,100%">
                      <LinearGradientBrush.GradientStops>
                        <GradientStop Offset="0" Color="Red" />
                        <GradientStop Offset="1" Color="Green" />
                      </LinearGradientBrush.GradientStops>
                    </LinearGradientBrush>
                  </TextDecoration.Stroke>
                </TextDecoration>
                <TextDecoration Location="Strikethrough"
                                StrokeThickness="1"
                                StrokeThicknessUnit="Pixel">
                  <TextDecoration.Stroke>
                    <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,100%">
                      <LinearGradientBrush.GradientStops>
                        <GradientStop Offset="0" Color="Green" />
                        <GradientStop Offset="1" Color="Blue" />
                      </LinearGradientBrush.GradientStops>
                    </LinearGradientBrush>
                  </TextDecoration.Stroke>
                </TextDecoration>
                <TextDecoration Location="Underline"
                                StrokeThickness="2"
                                StrokeThicknessUnit="Pixel">
                  <TextDecoration.Stroke>
                    <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,100%">
                      <LinearGradientBrush.GradientStops>
                        <GradientStop Offset="0" Color="Blue" />
                        <GradientStop Offset="1" Color="Red" />
                      </LinearGradientBrush.GradientStops>
                    </LinearGradientBrush>
                  </TextDecoration.Stroke>
                </TextDecoration>
              </TextDecorationCollection>
            </TextBlock.TextDecorations>
          </TextBlock>
        </StackPanel>
      </Border>
      <Border>
        <StackPanel Spacing="8">
          <TextBlock Text="🏻 👌🏻" />
          <TextBlock Text="🏼 👌🏼" />
          <TextBlock Text="🏽 👌🏽" />
          <TextBlock Text="🏾 👌🏾" />
          <TextBlock Text="🏿 👌🏿" />
        </StackPanel>
      </Border>
      <Border>
        <StackPanel Spacing="8">
          <TextBlock Text="👪 👨‍👩‍👧 👨‍👩‍👧‍👦" />
        </StackPanel>
      </Border>
      <Border>
        <SelectableTextBlock Margin="10" TextWrapping="Wrap">
          This <Span FontWeight="Bold">is</Span> a
          <Span Background="Silver" Foreground="Maroon">TextBlock</Span>
          with <Span TextDecorations="Underline">several</Span>
          <Span FontStyle="Italic">Span</Span> elements,
          <Span Foreground="Blue">
            using a <Bold>variety</Bold> of <Italic>styles</Italic>
          </Span>.
        </SelectableTextBlock>
      </Border>
    </WrapPanel>
  </StackPanel>
</UserControl>