AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.2" />

.NET API 1,168,384 bytes

 HtmlDialogElement

sealed class HtmlDialogElement : HtmlElement, IHtmlDialogElement, IHtmlElement, IElement, INode, IEventTarget, IMarkupFormattable, IParentNode, IChildNode, INonDocumentTypeChildNode, IElementCssInlineStyle
Represents the object for HTML dialog elements.
public bool Open { get; set; }

public string ReturnValue { get; set; }

public HtmlDialogElement(Document owner, string prefix = null)

public void Close(string returnValue = null)

public void Show(IElement anchor = null)

public void ShowModal(IElement anchor = null)