selector::-ms-clear

<form>
  <label for="firstname">First name:</label>
  <input type="text" id="firstname" name="firstname" placeholder="First name">
  <br>
  <label for="lastname">Last name:</label>
  <input type="text" id="lastname" name="lastname" placeholder="Second name">
</form>

input,
label {
  display: block;
}

input[type=text]::-ms-clear {
  color: red;/* This sets the cross color as red. */
  /* The cross can be hidden by setting the display attribute as "none" */
}