AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.1" />

.NET API 1,172,480 bytes

 CssBorderCollapseProperty

Information can be found on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/border-collapse
using AngleSharp.Css; namespace AngleSharp.Dom.Css { internal sealed class CssBorderCollapseProperty : CssProperty, ICssBorderCollapseProperty, ICssProperty { internal static readonly bool Default = true; internal static readonly IValueConverter<bool> Converter = Converters.Toggle(Keywords.Separate, Keywords.Collapse); private bool _separate; public bool IsSeparated => _separate; internal CssBorderCollapseProperty(CssStyleDeclaration rule) : base(PropertyNames.BorderCollapse, rule, PropertyFlags.Inherited) { Reset(); } public void SetSeparated(bool separate) { _separate = separate; } internal override void Reset() { _separate = Default; } protected override bool IsValid(ICssValue value) { return Converter.TryConvert(value, SetSeparated); } } }