Не работает кнопка <Enter> в WebBrowser

Html страницы, отображаемые в TWebBrowser часто имеют кнопки "Submit", и нажатие <Enter> не воспринимается непосредственно этой кнопкой.

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, OleCtrls, SHDocVw_TLB, ActiveX, StdCtrls;
 
type
  TForm1 = class(TForm)
    WebBrowser1: TWebBrowser;
    Button1: TButton;
    Button2: TButton;
    procedure FormDestroy(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
    FOleInPlaceActiveObject: IOleInPlaceActiveObject;
    procedure MsgHandler(var Msg: TMsg; var Handled: Boolean);
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
 
implementation
 
{$R *.dfm}
 
procedure TForm1.FormDestroy(Sender: TObject);
begin
  FOleInPlaceActiveObject := nil;
end;
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnMessage := MsgHandler;
end;
 
procedure TForm1.MsgHandler(var Msg: TMsg; var Handled: Boolean);
var
  iOIPAO: IOleInPlaceActiveObject;
  Dispatch: IDispatch;
begin
  if not Assigned(WebBrowser1) then
  begin
    Handled := False;
    Exit;
  end;
 
  Handled := (IsDialogMessage(WebBrowser1.Handle, Msg) = True);
 
  if (Handled) and (not WebBrowser1.Busy) then
  begin
    if FOleInPlaceActiveObject = nil then
    begin
      Dispatch := WebBrowser1.Application;
      if Dispatch <> nil then
      begin
        Dispatch.QueryInterface(IOleInPlaceActiveObject, iOIPAO);
        if iOIPAO <> nil then
          FOleInPlaceActiveObject := iOIPAO;
      end;
    end;
 
    if FOleInPlaceActiveObject <> nil then
      if ((Msg.message = WM_KEYDOWN) or (Msg.message = WM_KEYUP)) and
        ((Msg.wParam = VK_BACK) or (Msg.wParam = VK_LEFT) or (Msg.wParam = VK_RIGHT)) then
        //nothing - do not pass on Backspace, Left or Right arrows
      else
        FOleInPlaceActiveObject.TranslateAccelerator(Msg);
  end;
end;

Автор: Song

Взято из https://forum.sources.ru