MainWindow.xaml

<Window
    x:Class="ScriptVsNewWindow.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:local="clr-namespace:ScriptVsNewWindow"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
    x:Name="Root"
    Title="MainWindow"
    Width="800"
    Height="450"
    mc:Ignorable="d">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="0.7*" />
            <RowDefinition Height="0.3*" />
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal">
            <CheckBox
                x:Name="SetNewWindow"
                Margin="4"
                VerticalAlignment="Center"
                Content="Set NewWindow"
                IsChecked="False" />
            <StackPanel Orientation="Horizontal">
                <TextBlock
                    Margin="4"
                    VerticalAlignment="Center"
                    Text="Add Scripts:" />
                <ComboBox
                    x:Name="SetScripts"
                    Margin="0,4,4,4"
                    VerticalAlignment="Center"
                    SelectedIndex="0">
                    <ComboBoxItem>After</ComboBoxItem>
                    <ComboBoxItem>Before</ComboBoxItem>
                    <ComboBoxItem>None</ComboBoxItem>
                </ComboBox>
            </StackPanel>
            <StackPanel Orientation="Horizontal">
                <TextBlock
                    Margin="4"
                    VerticalAlignment="Center"
                    Text="Delay:" />
                <ComboBox
                    x:Name="Delay"
                    Margin="0,4,4,4"
                    VerticalAlignment="Center"
                    SelectedIndex="0">
                    <ComboBoxItem>None</ComboBoxItem>
                    <ComboBoxItem>1000</ComboBoxItem>
                    <ComboBoxItem>2000</ComboBoxItem>
                    <ComboBoxItem>3000</ComboBoxItem>
                </ComboBox>
            </StackPanel>
            <CheckBox
                x:Name="SetSource"
                Margin="4"
                VerticalAlignment="Center"
                Content="Set Source"
                IsChecked="True" />
            <CheckBox
                x:Name="ScheduleNewWindow"
                Margin="4"
                VerticalAlignment="Center"
                Content="Schedule New Window"
                IsChecked="False" />
            <Button
                x:Name="CopyLog"
                Margin="4"
                Padding="8,2"
                Click="CopyLog_Click">
                Copy Log
            </Button>
            <Button
                x:Name="ClearLog"
                Margin="4"
                Padding="8,2"
                Click="ClearLog_Click">
                Clear Log
            </Button>
        </StackPanel>
        <wv2:WebView2
            x:Name="WebView"
            Grid.Row="1"
            Grid.Column="0"
            Grid.ColumnSpan="1" />
        <Border
            Grid.Row="2"
            Margin="2"
            HorizontalAlignment="Stretch"
            VerticalAlignment="Top"
            BorderBrush="Black"
            BorderThickness="0,1,0,0" />
        <ScrollViewer Grid.Row="2" Margin="0,4,0,0">
            <ItemsControl ItemsSource="{Binding ElementName=Root, Path=Log}" />
        </ScrollViewer>
    </Grid>
</Window>