Does Ionic not compatible with HTML5 element?

Thanks for the reply, here is my example below. I can show the top part of it but cannot show the second part because they are just plain HTML element wrapped in ion-content. I hope it helps to understand my issue. Thanks & regards.

<ion-content padding>
<form novalidate #sForm="ngForm">
  <ion-item>
  <ion-label floating>First Name</ion-label>
    <ion-input
      type="text"
      name="name"
      ngModel></ion-input>
  </ion-item>

 /***** SECOND PART *****/
    <label>
    <span floating>Last Name</span>
    <input
      type="text"
      placeholder="LastName"
      name="name"
      ngModel>
  </label>
    <label>
    <span floating>User Name</span>
    <input
      type="text"
      placeholder="UserName"
      name="name"
      ngModel>
  </label>
</form>
</ion-content>