Workaround needed for WebView in UNO framework for WebAssembly

Currently, I am working on a UNO platform application which should display dynamically created HTML code in a WebView. This is working fine on UWP and Android, but not in the compiled WebAssembly. Is there some kind of workaround I could use here? I thought about a simple IFRAME, but obviously there is no possibility to include HTML in the XAML file. Or am I wrong?

To be more specific: The WebView's NavigateToString("<html><head></head><body>BLAH!</body><html>") method leads to the desired results in UWP and Android (iOS not tested).

Solution

Your code sample almost worked. With small adjustments, this is a working solution:

using System;
using System.Collections.Generic;
using System.Text;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Markup;

namespace MyProjectNamespace
{
    [ContentProperty(Name = nameof(HtmlContent))]
    public class WebAssemblyHtmlControl : Control
    {
        public WebAssemblyHtmlControl()
         : base(htmlTag: "div") // the root HTML tag of your content
        {
        }

        private string _html;

        public string HtmlContent
        {
            get => _html;
            set
            {
                base.SetHtmlContent(value); // this is a protected method on Wasm target   
                _html = value;
            }
        }
    }
}

And in XAML:

<WebAssemblyHtmlControl HtmlContent="{Binding HtmlString}" />