HTMLWebViewSource Video FullScreen option is disabled

Question

I am trying to play a video in the WebView on a Xamarin app. The video runs fine as it is expected to do but the fullscreen option on the controls of the video is disabled.

XAML:

<WebView Source="{Binding Source}" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>

Code:

public object Source
{
    get
    {
        var HTML = new HtmlWebViewSource();
        HTML.Html = $@"<video controls><source src=""{PathToVideo}""></video>";;
        return HTML;
    }
}

Image of the Webview page