AngleSharp by Florian Rappl

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

.NET API 681,472 bytes

 CSSQuotesProperty

public sealed class CSSQuotesProperty : CSSProperty
Information can be found on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/quotes
public IEnumerable<Tuple<string, string>> Quotes { get; }

Gets the enumeration with pairs of values for open-quote and close-quote. The first pair represents the outer level of quotation, the second pair is for the first nested level, next pair for third level and so on.