Semi.Avalonia/demo/Semi.Avalonia.Demo/Pages/SelectableTextBlock.axaml

<UserControl
    x:Class="Semi.Avalonia.Demo.Pages.SelectableTextBlockDemo"
    xmlns="https://github.com/avaloniaui"
    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"
    d:DesignHeight="600"
    d:DesignWidth="800"
    mc:Ignorable="d">
    <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
        <StackPanel Orientation="Horizontal">
            <StackPanel.Styles>
                <Style Selector="Grid > SelectableTextBlock">
                    <Setter Property="VerticalAlignment" Value="Center" />
                    <Setter Property="Margin" Value="4" />
                </Style>
            </StackPanel.Styles>
            <HeaderedContentControl
                Width="400"
                Height="400"
                Margin="16"
                VerticalAlignment="Top"
                Header="Default Theme"
                Theme="{DynamicResource GroupBox}">
                <Grid
                    VerticalAlignment="Top"
                    ColumnDefinitions="Auto, *"
                    RowDefinitions="*,*,*,*,*,*,*,*,*,*,*">
                    <Grid.Styles>
                        <Style Selector="SelectableTextBlock">
                            <Setter Property="VerticalAlignment" Value="Center" />
                            <Setter Property="Margin" Value="4" />
                        </Style>
                    </Grid.Styles>
                    <SelectableTextBlock Grid.Row="0" Grid.Column="0">Classes</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="1" Grid.Column="0">-</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="2" Grid.Column="0">Secondary</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="3" Grid.Column="0">Tertiary</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="4" Grid.Column="0">Quaternary</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="5" Grid.Column="0">Success</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="6" Grid.Column="0">Warning</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="7" Grid.Column="0">Danger</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="8" Grid.Column="0">Mark</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="9" Grid.Column="0">Underline</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="10" Grid.Column="0">Delete</SelectableTextBlock>

                    <SelectableTextBlock Grid.Row="1" Grid.Column="1">Text</SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="2"
                        Grid.Column="1"
                        Classes="Secondary">
                        Secondary
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="3"
                        Grid.Column="1"
                        Classes="Tertiary">
                        Tertiary
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="4"
                        Grid.Column="1"
                        Classes="Quaternary">
                        Quaternary
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="5"
                        Grid.Column="1"
                        Classes="Success">
                        Success
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="6"
                        Grid.Column="1"
                        Classes="Warning">
                        Warning
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="7"
                        Grid.Column="1"
                        Classes="Danger">
                        Danger
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="8"
                        Grid.Column="1"
                        Classes="Mark">
                        Default Mark
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="9"
                        Grid.Column="1"
                        Classes="Underline">
                        Underline
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="10"
                        Grid.Column="1"
                        Classes="Delete">
                        Delete
                    </SelectableTextBlock>
                </Grid>
            </HeaderedContentControl>
            <HeaderedContentControl
                Width="400"
                Height="400"
                Margin="16"
                VerticalAlignment="Top"
                Header="Theme: TitleSelectableTextBlock"
                Theme="{DynamicResource GroupBox}">
                <Grid
                    VerticalAlignment="Top"
                    ColumnDefinitions="Auto, *"
                    RowDefinitions="*,*,*,*,*,*,*">
                    <SelectableTextBlock Grid.Row="0" Grid.Column="0">Classes</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="1" Grid.Column="0">H1</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="2" Grid.Column="0">H2</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="3" Grid.Column="0">H3</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="4" Grid.Column="0">H4</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="5" Grid.Column="0">H5</SelectableTextBlock>
                    <SelectableTextBlock Grid.Row="6" Grid.Column="0">H6</SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="1"
                        Grid.Column="1"
                        Classes="H1"
                        Theme="{StaticResource TitleSelectableTextBlock}">
                        Header 1
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="2"
                        Grid.Column="1"
                        Classes="H2"
                        Theme="{StaticResource TitleSelectableTextBlock}">
                        Header 2
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="3"
                        Grid.Column="1"
                        Classes="H3"
                        Theme="{StaticResource TitleSelectableTextBlock}">
                        Header 3
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="4"
                        Grid.Column="1"
                        Classes="H4"
                        Theme="{StaticResource TitleSelectableTextBlock}">
                        Header 4
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="5"
                        Grid.Column="1"
                        Classes="H5"
                        Theme="{StaticResource TitleSelectableTextBlock}">
                        Header 5
                    </SelectableTextBlock>
                    <SelectableTextBlock
                        Grid.Row="6"
                        Grid.Column="1"
                        Classes="H6"
                        Theme="{StaticResource TitleSelectableTextBlock}">
                        Header 6
                    </SelectableTextBlock>
                </Grid>
            </HeaderedContentControl>
        </StackPanel>
    </ScrollViewer>
</UserControl>