using Ganss.Xss;
var sanitizer = new HtmlSanitizer();
var html = @"<script>alert('xss')</script><div onload=""alert('xss')"""
    + @"style=""background-color: rgba(0, 0, 0, 1)"">Test<img src=""test.png"""
    + @"style=""background-image: url(javascript:alert('xss')); margin: 10px""></div>";
var sanitized = sanitizer.Sanitize(html, "https://www.example.com");
var expected = @"<div style=""background-color: rgba(0, 0, 0, 1)"">"
    + @"Test<img src=""https://www.example.com/test.png"" style=""margin: 10px""></div>";
Assert.Equal(expected, sanitized);