AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.7.0" />

.NET API 997,888 bytes

 HTMLIFrameElement

sealed class HTMLIFrameElement : HTMLFrameElementBase, IHtmlInlineFrameElement, IHtmlElement, IElement, INode, IEventTarget, IParentNode, IChildNode, INonDocumentTypeChildNode, IElementCssInlineStyle
Represents the HTML iframe element.
public Alignment Align { get; set; }

Gets or sets the value of the alignment attribute.

public string ContentHtml { get; set; }

Gets the content of the page that the nested browsing context is to contain.

public IWindow ContentWindow { get; }

Gets the frame's parent's window context.

public bool IsFullscreenAllowed { get; set; }

Gets or sets if the frame's content can trigger the fullscreen mode.

public bool IsSeamless { get; set; }

Gets or sets the value of the seamless attribute.

public ISettableTokenList Sandbox { get; }