Добавить HTML к TWebBrowser Document

uses
  MSHTML;
 
procedure TForm1.Button1Click(Sender: TObject);
var
  Range: IHTMLTxtRange;
begin
  Range := ((WebBrowser1.Document as IHTMLDocument2).body as
    IHTMLBodyElement).createTextRange;
  Range.collapse(False);
  Range.pasteHTML('<br><b>Hello!</b>');
end;
 
procedure TForm1.Button2Click(Sender: TObject);
begin
  Webbrowser1.Navigate('www.google.ch');
end;

unit Unit1;
// by Sprint
 
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.

Взято с сайта https://www.swissdelphicenter.ch/en/tipsindex.php