Dynamically Setting WebView Height in .NET MAUI for Varying HTML Content on iOS Platform

I am using a custom WebView in my .NET MAUI application to display dynamic HTML content on iOS. The HTML content changes daily, and I need to adjust the height of the WebView accordingly.

Custom WebView Renderer (iOS)

Here’s my custom WebViewRenderer implementation:

public class MyWebViewRenderer : ViewRenderer<MyWebView, WKWebView>
{
    WKWebView _wkWebView;

    protected override void OnElementChanged(ElementChangedEventArgs<MyWebView> e)
    {
        base.OnElementChanged(e);

        if (Control == null)
        {
            var config = new WKWebViewConfiguration();
            config.AllowsInlineMediaPlayback = true;
            _wkWebView = new WKWebView(Frame, config);
            //transparent background
            _wkWebView = new WKWebView(CGRect.Empty, config);
            _wkWebView.BackgroundColor = UIColor.Clear;
            _wkWebView.ScrollView.BackgroundColor = UIColor.Clear;
            _wkWebView.ScrollView.ScrollEnabled = false;
            _wkWebView.Opaque = false;
            _wkWebView.NavigationDelegate = new MyNavigationDelegate();
            SetNativeControl(_wkWebView);

            if (Device.Idiom == TargetIdiom.Tablet)
            {
                //when targeting on iPad, add this to force the iPad behavior
                _wkWebView.Configuration.DefaultWebpagePreferences.PreferredContentMode = WKContentMode.Mobile;
            }
            SetNativeControl(_wkWebView);
        }
    }

    public class MyNavigationDelegate : WKNavigationDelegate
    {
        public override void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
        {
            string fontSize = "";
            if (Device.Idiom == TargetIdiom.Phone)
            {
                fontSize = "500%"; // > 100% shows larger than previous
            }
            else if (Device.Idiom == TargetIdiom.Tablet)
            {
                fontSize = "320%"; // > 100% shows larger than previous
            }

            string injectCustomFontScript = @"
                let style = document.createElement('style');
                style.innerHTML = `
                    @font-face {
                        font-family: 'CustomFont';
                        src: url('Poppins-Light') format('truetype');
                    }
                    body, p, h1, h2, h3, h5, h6 {
                        font-family: 'CustomFont', sans-serif !important;
                        color: #313131 !important;
                    }
                    h4 {
                        font-family: 'CustomFont', sans-serif !important;
                        color: #679E18 !important;
                    }
                `;
                document.head.appendChild(style);
            ";

            string stringsss = String.Format(@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '{0}'", fontSize);
            WKJavascriptEvaluationResult handler = (NSObject result, NSError err) =>
            {
                if (err != null)
                {
                    System.Console.WriteLine(err);
                }
                if (result != null)
                {
                    System.Console.WriteLine(result);
                }
            };
            webView.EvaluateJavaScript(stringsss, handler);
            webView.EvaluateJavaScript(injectCustomFontScript, handler);
        }

    }

    protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        base.OnElementPropertyChanged(sender, e);

        if (e.PropertyName == "Url")
        {
            string finalHtml = Element.Url.Replace("width=\"640\"", "width=\"1000\"");
            Control.LoadHtmlString(finalHtml, null);
        }
    }
}

XAML Code:

<local:MyWebView 
    x:Name="ios_web_view"
    Margin="0,5,0,0"
    Grid.Row="0"
    HorizontalOptions="FillAndExpand"
    VerticalOptions="FillAndExpand">
    <local:MyWebView.HeightRequest>
        <OnIdiom x:TypeArguments="x:Double">
            <OnIdiom.Phone>10000</OnIdiom.Phone>
            <OnIdiom.Tablet>15000</OnIdiom.Tablet>
            <OnIdiom.Desktop>10000</OnIdiom.Desktop>
        </OnIdiom>
    </local:MyWebView.HeightRequest>
</local:MyWebView>

I want the WebView height to automatically adjust based on the HTML content’s height instead of setting a fixed HeightRequest. Since the content changes daily, I cannot hardcode a specific height.

Complete Layout:

<ContentPage 
xmlns=";
xmlns:x=";
xmlns:mc=";
xmlns:toolkit=";
x:Name="ContentPage"
BackgroundColor="#F5F5F5"
xmlns:ffimageloading="clr-namespace:FFImageLoading.Maui;assembly=FFImageLoading.Maui"
xmlns:fftransformations="clr-namespace:FFImageLoading.Transformations;assembly=FFImageLoading.Maui"
xmlns:local="clr-namespace:Renderer"
x:Class="Views.DailyReadingPage">

<ContentPage.Behaviors>
    <toolkit:StatusBarBehavior StatusBarColor="#0279B5" StatusBarStyle="DarkContent" />
</ContentPage.Behaviors>

<ContentPage.Content>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="8*" />
            <RowDefinition Height="82*" />
            <RowDefinition Height="10*" />
        </Grid.RowDefinitions>

        <!--Header Layout-->
        <StackLayout
            Grid.Row="0"
            BackgroundColor="#0191da"
            Orientation="Vertical"
            VerticalOptions="FillAndExpand"
            HorizontalOptions="FillAndExpand">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="{OnIdiom Phone=60, Tablet=90, Desktop=60}" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="1.5*"/>
                    <ColumnDefinition Width="7*"/>
                    <ColumnDefinition Width="1.5*"/>
                </Grid.ColumnDefinitions>
       //Header Layout
            </Grid>
        </StackLayout>
        
        <!--main Content View-->
        <Grid
            Grid.Row="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>

            <Grid
                Grid.Row="0">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                
                <Grid
                    Grid.Row="0"
                    HorizontalOptions="FillAndExpand"
                    VerticalOptions="FillAndExpand"
                    Padding="5">

                    <Grid.RowDefinitions>
                        <RowDefinition Height="18*" />
                        <RowDefinition Height="82*" />
                        <!--<RowDefinition Height="8*" />-->
                    </Grid.RowDefinitions>

                    <StackLayout Grid.Row="0" Orientation="Vertical"
                            Padding="0">
                        <!--Title content>
                    </StackLayout>
                        
                    <Frame
                        Grid.Row="1"
                        Margin="0,10,0,0" 
                        Padding="0"
                        CornerRadius="{OnIdiom Phone=20, Tablet=30, Desktop=20}"
                        VerticalOptions="FillAndExpand"
                        x:Name="ios_layout">
                        <ScrollView
                            Orientation="Vertical"
                            VerticalOptions="FillAndExpand">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*" />
                                <RowDefinition Height="Auto" />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>

                            <!-- Background image -->
                            <Image Aspect="Fill" HorizontalOptions="FillAndExpand" Grid.Row="0" Source="ic_daily_reading_new_bg_xx.png"/>

                            <!-- Main content -->
                            <local:MyWebView 
                                x:Name="ios_web_view"
                                Margin="0,5,0,0"
                                Grid.Row="0"
                                HorizontalOptions="FillAndExpand"
                                VerticalOptions="FillAndExpand">
                                <local:MyWebView.HeightRequest>
                                    <OnIdiom x:TypeArguments="x:Double">
                                        <OnIdiom.Phone>10000</OnIdiom.Phone>
                                        <OnIdiom.Tablet>15000</OnIdiom.Tablet>
                                        <OnIdiom.Desktop>10000</OnIdiom.Desktop>
                                    </OnIdiom>
                                </local:MyWebView.HeightRequest>
                            </local:MyWebView>

                            <!-- Audio frame -->
                            <Frame
                                x:Name="ios_audio_frame"
                                Grid.Row="1"
                                BackgroundColor="#666664"
                                Padding="0"
                                CornerRadius="{OnIdiom Phone=30, Tablet=45, Desktop=30}"
                                Margin="0,0,0,15"
                                HorizontalOptions="CenterAndExpand"
                                VerticalOptions="EndAndExpand">

                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="25*" />
                                        <ColumnDefinition Width="50*" />
                                        <ColumnDefinition Width="25*" />
                                    </Grid.ColumnDefinitions>
            //Audio Layout
                                </Grid>

                                <Frame.WidthRequest>
                                    <OnIdiom x:TypeArguments="x:Double">
                                        <OnIdiom.Phone>370</OnIdiom.Phone>
                                        <OnIdiom.Tablet>950</OnIdiom.Tablet>
                                        <OnIdiom.Desktop>370</OnIdiom.Desktop>
                                    </OnIdiom>
                                </Frame.WidthRequest>
                                <Frame.HeightRequest>
                                    <OnIdiom x:TypeArguments="x:Double">
                                        <OnIdiom.Phone>64</OnIdiom.Phone>
                                        <OnIdiom.Tablet>96</OnIdiom.Tablet>
                                        <OnIdiom.Desktop>64</OnIdiom.Desktop>
                                    </OnIdiom>
                                </Frame.HeightRequest>
                            </Frame>

                            <!-- Frame footer image -->
                            <ffimageloading:CachedImage 
                                Grid.Row="2"
                                Aspect="AspectFit"
                                HorizontalOptions="Fill"
                                VerticalOptions="End"
                                Source="ic_jesus_xx.png">
                            </ffimageloading:CachedImage>
                        </Grid>
                        </ScrollView>
                    </Frame>
                </Grid>
                <Grid.GestureRecognizers>
                    <PinchGestureRecognizer PinchUpdated="OnPinchUpdated"/>
                </Grid.GestureRecognizers>
            </Grid>
        </Grid>

        <!--Footer Layout-->
        <Grid
            Grid.Row="2"
            VerticalOptions="Center"
            BackgroundColor="White">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
            </Grid.ColumnDefinitions>
     //Footer Layout
            <Grid.HeightRequest>
                <OnIdiom x:TypeArguments="x:Double">
                    <OnIdiom.Phone>60</OnIdiom.Phone>
                    <OnIdiom.Tablet>90</OnIdiom.Tablet>
                    <OnIdiom.Desktop>60</OnIdiom.Desktop>
                </OnIdiom>
            </Grid.HeightRequest>
        </Grid>
    </Grid>
</ContentPage.Content>

I am using a custom WebView in my .NET MAUI application to display dynamic HTML content on iOS. The HTML content changes daily, and I need to adjust the height of the WebView accordingly.

Custom WebView Renderer (iOS)

Here’s my custom WebViewRenderer implementation:

public class MyWebViewRenderer : ViewRenderer<MyWebView, WKWebView>
{
    WKWebView _wkWebView;

    protected override void OnElementChanged(ElementChangedEventArgs<MyWebView> e)
    {
        base.OnElementChanged(e);

        if (Control == null)
        {
            var config = new WKWebViewConfiguration();
            config.AllowsInlineMediaPlayback = true;
            _wkWebView = new WKWebView(Frame, config);
            //transparent background
            _wkWebView = new WKWebView(CGRect.Empty, config);
            _wkWebView.BackgroundColor = UIColor.Clear;
            _wkWebView.ScrollView.BackgroundColor = UIColor.Clear;
            _wkWebView.ScrollView.ScrollEnabled = false;
            _wkWebView.Opaque = false;
            _wkWebView.NavigationDelegate = new MyNavigationDelegate();
            SetNativeControl(_wkWebView);

            if (Device.Idiom == TargetIdiom.Tablet)
            {
                //when targeting on iPad, add this to force the iPad behavior
                _wkWebView.Configuration.DefaultWebpagePreferences.PreferredContentMode = WKContentMode.Mobile;
            }
            SetNativeControl(_wkWebView);
        }
    }

    public class MyNavigationDelegate : WKNavigationDelegate
    {
        public override void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
        {
            string fontSize = "";
            if (Device.Idiom == TargetIdiom.Phone)
            {
                fontSize = "500%"; // > 100% shows larger than previous
            }
            else if (Device.Idiom == TargetIdiom.Tablet)
            {
                fontSize = "320%"; // > 100% shows larger than previous
            }

            string injectCustomFontScript = @"
                let style = document.createElement('style');
                style.innerHTML = `
                    @font-face {
                        font-family: 'CustomFont';
                        src: url('Poppins-Light') format('truetype');
                    }
                    body, p, h1, h2, h3, h5, h6 {
                        font-family: 'CustomFont', sans-serif !important;
                        color: #313131 !important;
                    }
                    h4 {
                        font-family: 'CustomFont', sans-serif !important;
                        color: #679E18 !important;
                    }
                `;
                document.head.appendChild(style);
            ";

            string stringsss = String.Format(@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '{0}'", fontSize);
            WKJavascriptEvaluationResult handler = (NSObject result, NSError err) =>
            {
                if (err != null)
                {
                    System.Console.WriteLine(err);
                }
                if (result != null)
                {
                    System.Console.WriteLine(result);
                }
            };
            webView.EvaluateJavaScript(stringsss, handler);
            webView.EvaluateJavaScript(injectCustomFontScript, handler);
        }

    }

    protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        base.OnElementPropertyChanged(sender, e);

        if (e.PropertyName == "Url")
        {
            string finalHtml = Element.Url.Replace("width=\"640\"", "width=\"1000\"");
            Control.LoadHtmlString(finalHtml, null);
        }
    }
}

XAML Code:

<local:MyWebView 
    x:Name="ios_web_view"
    Margin="0,5,0,0"
    Grid.Row="0"
    HorizontalOptions="FillAndExpand"
    VerticalOptions="FillAndExpand">
    <local:MyWebView.HeightRequest>
        <OnIdiom x:TypeArguments="x:Double">
            <OnIdiom.Phone>10000</OnIdiom.Phone>
            <OnIdiom.Tablet>15000</OnIdiom.Tablet>
            <OnIdiom.Desktop>10000</OnIdiom.Desktop>
        </OnIdiom>
    </local:MyWebView.HeightRequest>
</local:MyWebView>

I want the WebView height to automatically adjust based on the HTML content’s height instead of setting a fixed HeightRequest. Since the content changes daily, I cannot hardcode a specific height.

Complete Layout:

<ContentPage 
xmlns="http://schemas.microsoft/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft/winfx/2009/xaml"
xmlns:mc="http://schemas.openxmlformats./markup-compatibility/2006"
xmlns:toolkit="http://schemas.microsoft/dotnet/2022/maui/toolkit"
x:Name="ContentPage"
BackgroundColor="#F5F5F5"
xmlns:ffimageloading="clr-namespace:FFImageLoading.Maui;assembly=FFImageLoading.Maui"
xmlns:fftransformations="clr-namespace:FFImageLoading.Transformations;assembly=FFImageLoading.Maui"
xmlns:local="clr-namespace:Renderer"
x:Class="Views.DailyReadingPage">

<ContentPage.Behaviors>
    <toolkit:StatusBarBehavior StatusBarColor="#0279B5" StatusBarStyle="DarkContent" />
</ContentPage.Behaviors>

<ContentPage.Content>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="8*" />
            <RowDefinition Height="82*" />
            <RowDefinition Height="10*" />
        </Grid.RowDefinitions>

        <!--Header Layout-->
        <StackLayout
            Grid.Row="0"
            BackgroundColor="#0191da"
            Orientation="Vertical"
            VerticalOptions="FillAndExpand"
            HorizontalOptions="FillAndExpand">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="{OnIdiom Phone=60, Tablet=90, Desktop=60}" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="1.5*"/>
                    <ColumnDefinition Width="7*"/>
                    <ColumnDefinition Width="1.5*"/>
                </Grid.ColumnDefinitions>
       //Header Layout
            </Grid>
        </StackLayout>
        
        <!--main Content View-->
        <Grid
            Grid.Row="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>

            <Grid
                Grid.Row="0">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                
                <Grid
                    Grid.Row="0"
                    HorizontalOptions="FillAndExpand"
                    VerticalOptions="FillAndExpand"
                    Padding="5">

                    <Grid.RowDefinitions>
                        <RowDefinition Height="18*" />
                        <RowDefinition Height="82*" />
                        <!--<RowDefinition Height="8*" />-->
                    </Grid.RowDefinitions>

                    <StackLayout Grid.Row="0" Orientation="Vertical"
                            Padding="0">
                        <!--Title content>
                    </StackLayout>
                        
                    <Frame
                        Grid.Row="1"
                        Margin="0,10,0,0" 
                        Padding="0"
                        CornerRadius="{OnIdiom Phone=20, Tablet=30, Desktop=20}"
                        VerticalOptions="FillAndExpand"
                        x:Name="ios_layout">
                        <ScrollView
                            Orientation="Vertical"
                            VerticalOptions="FillAndExpand">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*" />
                                <RowDefinition Height="Auto" />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>

                            <!-- Background image -->
                            <Image Aspect="Fill" HorizontalOptions="FillAndExpand" Grid.Row="0" Source="ic_daily_reading_new_bg_xx.png"/>

                            <!-- Main content -->
                            <local:MyWebView 
                                x:Name="ios_web_view"
                                Margin="0,5,0,0"
                                Grid.Row="0"
                                HorizontalOptions="FillAndExpand"
                                VerticalOptions="FillAndExpand">
                                <local:MyWebView.HeightRequest>
                                    <OnIdiom x:TypeArguments="x:Double">
                                        <OnIdiom.Phone>10000</OnIdiom.Phone>
                                        <OnIdiom.Tablet>15000</OnIdiom.Tablet>
                                        <OnIdiom.Desktop>10000</OnIdiom.Desktop>
                                    </OnIdiom>
                                </local:MyWebView.HeightRequest>
                            </local:MyWebView>

                            <!-- Audio frame -->
                            <Frame
                                x:Name="ios_audio_frame"
                                Grid.Row="1"
                                BackgroundColor="#666664"
                                Padding="0"
                                CornerRadius="{OnIdiom Phone=30, Tablet=45, Desktop=30}"
                                Margin="0,0,0,15"
                                HorizontalOptions="CenterAndExpand"
                                VerticalOptions="EndAndExpand">

                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="25*" />
                                        <ColumnDefinition Width="50*" />
                                        <ColumnDefinition Width="25*" />
                                    </Grid.ColumnDefinitions>
            //Audio Layout
                                </Grid>

                                <Frame.WidthRequest>
                                    <OnIdiom x:TypeArguments="x:Double">
                                        <OnIdiom.Phone>370</OnIdiom.Phone>
                                        <OnIdiom.Tablet>950</OnIdiom.Tablet>
                                        <OnIdiom.Desktop>370</OnIdiom.Desktop>
                                    </OnIdiom>
                                </Frame.WidthRequest>
                                <Frame.HeightRequest>
                                    <OnIdiom x:TypeArguments="x:Double">
                                        <OnIdiom.Phone>64</OnIdiom.Phone>
                                        <OnIdiom.Tablet>96</OnIdiom.Tablet>
                                        <OnIdiom.Desktop>64</OnIdiom.Desktop>
                                    </OnIdiom>
                                </Frame.HeightRequest>
                            </Frame>

                            <!-- Frame footer image -->
                            <ffimageloading:CachedImage 
                                Grid.Row="2"
                                Aspect="AspectFit"
                                HorizontalOptions="Fill"
                                VerticalOptions="End"
                                Source="ic_jesus_xx.png">
                            </ffimageloading:CachedImage>
                        </Grid>
                        </ScrollView>
                    </Frame>
                </Grid>
                <Grid.GestureRecognizers>
                    <PinchGestureRecognizer PinchUpdated="OnPinchUpdated"/>
                </Grid.GestureRecognizers>
            </Grid>
        </Grid>

        <!--Footer Layout-->
        <Grid
            Grid.Row="2"
            VerticalOptions="Center"
            BackgroundColor="White">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
            </Grid.ColumnDefinitions>
     //Footer Layout
            <Grid.HeightRequest>
                <OnIdiom x:TypeArguments="x:Double">
                    <OnIdiom.Phone>60</OnIdiom.Phone>
                    <OnIdiom.Tablet>90</OnIdiom.Tablet>
                    <OnIdiom.Desktop>60</OnIdiom.Desktop>
                </OnIdiom>
            </Grid.HeightRequest>
        </Grid>
    </Grid>
</ContentPage.Content>

Share Improve this question edited 2 days ago asked Feb 17 at 10:06 Matthew Pans 8191 gold badge11 silver badges27 bronze badges

What are the rules for changing the height? Have you tried using Event or Messenger to change the Height at runtime? – Liqun Shen-MSFT Commented Feb 17 at 13:29
@LiqunShen-MSFT Based on the HTML content size we need to set the height. I didn't try Event or Messenger. Can you show an example? – Matthew Pans Commented Feb 18 at 6:23
Could you also show the layout of the ContentPage which contains the WebView? What .NET version do you use? – Liqun Shen-MSFT Commented 2 days ago
The .NET version is 8, and I have updated the ContentPage layout code on the question. Could you please check? – Matthew Pans Commented 2 days ago
@LiqunShen-MSFT I have tried the suggested solution, and it is working. However, when I applied the same approach to another custom WebView renderer, it did not work. So, I posted a new question regarding this issue. Could you please check? stackoverflow/questions/79453991/… – Matthew Pans Commented yesterday

Add a comment |

1 Answer 1

Sorted by: Reset to default 1

You can customize the MyNavigationDelegate to calculate the WebView Height based on WKWebView.ScrollView. You may try the following way to adjust the height,

In the MyNavigationDelegate method, add a Constructor and set the value for myWebViewRenderer. Then in the DidFinishNavigation method, set the WebView's HeightRequest.

    public class MyNavigationDelegate : WKNavigationDelegate
    {
        MyWebViewRenderer myWebViewRenderer;
        public MyNavigationDelegate(MyWebViewRenderer webViewRenderer)
        {
            myWebViewRenderer = webViewRenderer;
        }


        public async override void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
        {
            ......

            //add the following code
            var wv = myWebViewRenderer.Element as MyWebView;
            if (webView != null)
            {                  
                if (webView.ScrollView != null && webView.ScrollView.ContentSize != null)
                {
                    //wait for the content to be rendererd
                    await Task.Delay(200);  
                    wv.HeightRequest = (double)webView.ScrollView.ContentSize.Height;
                }
            }
        }

And in OnElementChanged, set

        if (Control == null)
        {
           ....
            _wkWebView.NavigationDelegate = new MyNavigationDelegate(this);
            SetNativeControl(_wkWebView);

        }

Hope it helps!

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Dynamically Setting WebView Height in .NET MAUI for Varying HTML Content on iOS Platform - Stack Overflow

1 Answer 1

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