CssBackgroundSizeProperty sealed class CssBackgroundSizeProperty : CssProperty, ICssBackgroundSizeProperty, ICssProperty More information available at: https://developer.mozilla.org/en-US/docs/Web/CSS/background-size Documentation Code public IEnumerable<bool> IsContained { get; } public IEnumerable<bool> IsCovered { get; } public IEnumerable<Point> Sizes { get; } public void SetSizes(IEnumerable<BackgroundSize> sizes)