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HTML 

              
                <html>
  <head>
    <title>HTML5 Manejo del Atributo 'required' usando JQuery</title>
  </head>  
  <body>
    <div class="cform">
      <form actio="#">
   <input type="text" name="field1" placeholder="Nombre (*)" required/> 
   <input type="email" name="field2" placeholder="Email (*)" required/>
   <input type="tel" name="field2" placeholder="Telefono" />
   <input type="submit" value="Enviar" />
      </form>  
      <span class="requeridof">(*) Campo requerido</span>
    </div> 
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
  </body>    
 </html>
!

CSS 

              
                .cform{
    font: 95% Arial, Helvetica, sans-serif;
    max-width: 400px;
    margin: 10px auto;
    padding:30px  16px;
    background: #a3ccff;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    border: 5px solid #0056c1;
    
}

.form-error {
	display:none;
	position:absolute;
	top:0;
	right:0;
	font-size:11px;
	line-height:20px;
	font-style:italic;
	background:#9A2C2C;
	color:#FFF;
	padding:5px 10px;
	box-shadow:inset 0 -1px 3px rgba(0,0,0,0.3),inset 0 1px 3px rgba(0,0,0,0.3);
	-webkit-box-shadow:inset 0 -1px 3px rgba(0,0,0,0.3),inset 0 1px 3px rgba(0,0,0,0.3);
	-moz-box-shadow:inset 0 -1px 3px rgba(0,0,0,0.3),inset 0 1px 3px rgba(0,0,0,0.3);
}


.cform input[type="tel"],
.cform input[type="text"],
.cform input[type="date"],
.cform input[type="datetime"],
.cform input[type="email"],
.cform input[type="number"],
.cform input[type="search"],
.cform input[type="time"],
.cform input[type="url"],
.cform textarea,
.cform select 
{
    -webkit-transition: all 0.30s ease-in-out;
    -moz-transition: all 0.30s ease-in-out;
    -ms-transition: all 0.30s ease-in-out;
    -o-transition: all 0.30s ease-in-out;
    outline: none;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    width: 100%;
    background: #fff;
    margin-bottom: 4%;
    border: 1px solid #ccc;
    padding: 3%;
    color: #555;
    font: 95% Arial, Helvetica, sans-serif;
}
.cform input[type="tel"]:focus,
.cform input[type="text"]:focus,
.cform input[type="date"]:focus,
.cform input[type="datetime"]:focus,
.cform input[type="email"]:focus,
.cform input[type="number"]:focus,
.cform input[type="search"]:focus,
.cform input[type="time"]:focus,
.cform input[type="url"]:focus,
.cform textarea:focus,
.cform select:focus
{
    box-shadow: 0 0 5px #43D1AF;
    padding: 3%;
    border: 1px solid #43D1AF;
}

.requeridof {
  margin-top:10px;
  text-align:center;
  display:block;
  font: italic bold 12px/30px Georgia, serif;
  color:red;
}

.cform input[type="submit"], 
.cform input[type="button"]{
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    width: 100%;
    padding: 3%;
    background: #0049a4;
    border-bottom: 2px solid #30C29E;
    border-top-style: none;
    border-right-style: none;
    border-left-style: none;    
    color: #fff;
}
.cform input[type="submit"]:hover,
.cform input[type="button"]:hover{
    background: #025dcd;
}
!

JS 

              
                // Demo script, feature detect inverted
$(function () {
			
			// feature detect
			var supportsRequired = 'required' in document.createElement('input');
			
			// loop through required attributes
			$('[required]').each(function () {
			
				// if 'required' isn't supported
				if (!supportsRequired) {
				
					// this
					var self = $(this);
				
					// swap attribute for class
					self.removeAttr('required').addClass('required');
					
					// append an error message
					self.parent().append('<span class="form-error">Requerido</span>');
					
				}
				
			});
			
			// submit the form
			$('.form').on('submit', function (e) {
			
				// loop through class name required
				$('.required').each(function () {
				
					// this
					var self = $(this);
					
					// check shorthand if statement for input[type] detection
					var checked = (self.is(':checkbox') || self.is(':radio')) 
					? self.is(':not(:checked)') && $('input[name=' + self.attr('name') + ']:checked').length === 0 
					: false;
					
					// run the empty/not:checked test
					if (self.val() === '' || checked) {
							
						// show error if the values are empty still (or re-emptied)
						// this will fire after it's already been checked once
						self.siblings('.form-error').show();
						
						// stop form submitting
						e.preventDefault();
					
					// if it's passed the check
					} else {
					
						// hide the error
						self.siblings('.form-error').hide();
						
					}
					
				});
				
				// all other form submit handlers here
			
			});
			
			// key change on all form inputs
			$('input, textarea', '.form').on('blur change', function () {
			
				// this
				var self = $(this);
					
				// check shorthand if statement for input[type] detection
				var checked = (self.is(':checkbox') || self.is(':radio')) 
				? self.is(':not(:checked)') && $('input[name=' + self.attr('name') + ']:checked').length === 0 
				: false;
				
				// if empty on change, i.e. if data is removed
				if (self.val() === '' || checked) {
				
					// show/keep the error in view
					self.siblings('.form-error').show();
				
				// if there's a value or checked
				} else {
				
					// hide the error
					self.siblings('.form-error').hide();
					
				}
				
			});
		
		});
!
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