MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:ProxyWebView.Htttp; assembly=ProxyWebView"
             x:Class="ProxyWebView.MainPage">

    <StackLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
        <!--Webview genérica-->
        <!--<WebView HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" BackgroundColor="AliceBlue" x:Name="webview"/>-->

        <local:HybridWebView 
            x:Name="hwebview" 
            x:Uid="hwebview"
            HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
    </StackLayout>
</ContentPage>