AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.5.0" />

.NET API 681,472 bytes

 IValidityState

interface IValidityState
namespace AngleSharp.DOM.Html { internal interface IValidityState { bool ValueMissing { get; } bool TypeMismatch { get; } bool PatternMismatch { get; } bool TooLong { get; } bool RangeUnderflow { get; } bool RangeOverflow { get; } bool StepMismatch { get; } bool BadInput { get; } bool CustomError { get; } bool Valid { get; } } }