AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.0" />

.NET API 1,171,968 bytes

 CssColumnRuleWidthProperty

More information available at: https://developer.mozilla.org/en-US/docs/Web/CSS/column-rule-width
using AngleSharp.Css; namespace AngleSharp.Dom.Css { internal sealed class CssColumnRuleWidthProperty : CssProperty, ICssColumnRuleWidthProperty, ICssProperty { internal static readonly Length Default = Length.Medium; internal static readonly IValueConverter<Length> Converter = Converters.LineWidthConverter; private Length _width; public Length Width => _width; internal CssColumnRuleWidthProperty(CssStyleDeclaration rule) : base(PropertyNames.ColumnRuleWidth, rule, PropertyFlags.Animatable) { Reset(); } public void SetWidth(Length width) { _width = width; } internal override void Reset() { _width = Default; } protected override bool IsValid(ICssValue value) { return Converter.TryConvert(value, SetWidth); } } }