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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, OleCtrls, SHDocVw, MSHTML, StdCtrls;

type
  TForm1 = class(TForm)
    WebBrowser1: TWebBrowser;
    procedure FormCreate(Sender: TObject);
    procedure WebBrowser1DocumentComplete(Sender: TObject;
      const pDisp: IDispatch; var URL: OleVariant);
  private
    { Private-Deklarationen }
    FirstRun: Boolean;
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{--------------------------------------------------------------------------------------------------}

procedure TForm1.FormCreate(Sender: TObject);
begin

  FirstRun := True;
  WebBrowser1.Navigate('about:blank');

end;

{--------------------------------------------------------------------------------------------------}

procedure TForm1.WebBrowser1DocumentComplete(Sender: TObject;
  const pDisp: IDispatch; var URL: OleVariant);
var
  WebDoc: HTMLDocument;
  WebBody: HTMLBody;
begin

  if FirstRun then
    if pDisp = WebBrowser1.Application then
    begin
      FirstRun := False;
      WebDoc := WebBrowser1.Document as HTMLDocument;
      WebBody := WebDoc.body as HTMLBody;
      WebBody.insertAdjacentHTML('BeforeEnd', '<h1>Hello World!</h1>');
    end;

end;

{--------------------------------------------------------------------------------------------------}

end.