How to find a button with "value" in html page (Webbrowser - Delphi) -

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i have html page have 3 forms 3 submit buttons . buttons have no name have value :

<input type="submit" value="login">

how can find button value , click on it ?

thanks

procedure tform1.button1click(sender: tobject); var    ovelements: olevariant;    i: integer;  begin    ovelements := webbrowser1.oleobject.document.forms.item(0).elements;    := 0 (ovelements.length - 1)     if (ovelements.item(i).tagname = 'input') ,       (ovelements.item(i).type = 'submit') ,   (ovelements.item(i).value = 'login')       ovelements.item(i).click;  end;

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