ms-TextField

Also known as Text Box
The span-description is optional

<div class="ms-TextField"> 
<input class="ms-TextField-field" type="text" id="ID_textbox"> 
   <label>mytext</label> 
   <span>description</span> 
</div> 

<script type="text/javascript"> 
$(document).ready(function() { 
   if ($.fn.TextField) { 
      $('.ms-TextField'}.TextField();  
   } 
}); 
</script> 

Multi Line

ms-TextField--multiline

Placeholder

ms-TextField--placeholder

Underline

ms-TextField--underlined