Provides the System.Windows.Forms.HtmlElement which currently has user input focus.
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When the document has focus, but no element of the document has been given focus, HtmlDocument.ActiveElement returns the element corresponding to the <BODY> tag.
If the document does not have focus, HtmlDocument.ActiveElement returns null.
If the current element with input focus is a cell (TD) in an HTML TABLE tag, HtmlDocument.ActiveElement will return the element that contains the TABLE element.