AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.4" />

.NET API 1,229,312 bytes

 HtmlIFrameElement

sealed class HtmlIFrameElement : HtmlFrameElementBase, IHtmlInlineFrameElement, IHtmlElement, IElement, INode, IEventTarget, IMarkupFormattable, 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; }

public HtmlIFrameElement(Document owner, string prefix = null)