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                <!DOCTYPE html> 
      <h2>Xin chào các ban !!!</h2> 
      <p> <span id="demo" 
        là một trang thông tin với mục đích là để giới thiệu, cập nhật những thông tin về các doanh nghiệp, sản phẩm, hoạt động cũng như tin tức, chia sẻ bí quyết,… để phát triển thương hiệu</p> 
    <!-- Tạo nút button bằng javascript  -->    
    <button  type="button" onclick= 
         "document.getElementById('demo').innerHTML = 
                'Webaffiliate!!!'">Thay đổi</button>