Validation Summary Tag Helper trong ASP.NET Core

using System.ComponentModel.DataAnnotations;

namespace FormsTagHelper.ViewModels
{
    public class RegisterViewModel
    {
        [Required]
        [EmailAddress]
        [Display(Name = "Email Address")]
        public string Email { get; set; }

        [Required]
        [DataType(DataType.Password)]
        public string Password { get; set; }
    }
}

@model RegisterViewModel

<form asp-controller="Demo" asp-action="RegisterValidation" method="post">
    <div asp-validation-summary="ModelOnly"></div>
    <label>Email: <input asp-for="Email" /></label> <br />
    <span asp-validation-for="Email"></span><br />
    <label>Password: <input asp-for="Password" /></label><br />
    <span asp-validation-for="Password"></span><br />
    <button type="submit">Register</button>
</form>

<form action="/DemoReg/Register" method="post">
  <label>Email: <input name="Email" id="Email" type="email" value=""
   data-val-required="The Email field is required."
   data-val-email="The Email field is not a valid email address."
   data-val="true"></label><br>
  <span class="field-validation-valid" data-valmsg-replace="true"
   data-valmsg-for="Email"></span><br>
  <label>Password: <input name="Password" id="Password" type="password"
   data-val-required="The Password field is required." data-val="true"></label><br>
  <span class="field-validation-valid" data-valmsg-replace="true"
   data-valmsg-for="Password"></span><br>
  <button type="submit">Register</button>
  <input name="__RequestVerificationToken" type="hidden" value="<removed for brevity>">
</form>