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CSS, Responsive | Type: JavascriptResponsive Tabs to Accordian

At chosen break point, tabs become an accordian.

_____________________
HTML
<ul class="tabs">
  <li class="active" rel="tab1">Tab 1</li>
  <li rel="tab2">Tab 2</li>
  <li rel="tab3">Tab 3</li>

</ul>
<div class="tab_container">
  <h3 class="d_active tab_drawer_heading" rel="tab1">Tab 1</h3>
  <div id="tab1" class="tab_content">
  <h2>Tab 1 content</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ac metus augue.</p>
  </div>
  <!-- #tab1 -->
  <h3 class="tab_drawer_heading" rel="tab2">Tab 2</h3>
  <div id="tab2" class="tab_content">
  <h2>Tab 2 content</h2>
    <p>Nunc dui velit, scelerisque eu placerat volutpat, dapibus eu nisi. Vivamus eleifend vestibulum odio non vulputate.</p>
  </div>
  <!-- #tab2 -->
  <h3 class="tab_drawer_heading" rel="tab3">Tab 3</h3>
  <div id="tab3" class="tab_content">
  <h2>Tab 3 content</h2>
    <p>Nulla eleifend felis vitae velit tristique imperdiet. Etiam nec imperdiet elit. Pellentesque sem lorem, scelerisque sed facilisis sed, vestibulum sit amet eros.</p>
  </div>
  <!-- #tab3 -->
</div>
<!-- .tab_container -->
</div>

__________________________
CSS
ul.tabs {
	margin: 0;
	padding: 0;
	float: left;
	list-style: none;
	height: 32px;
	border-bottom: 1px solid #333;
	width: 100%;
}

ul.tabs li {
	float: left;
	margin: 0;
	cursor: pointer;
	padding: 0;
  width:32%;
  text-align:center;
  margin-right:2%;
	height: 31px;
	line-height: 31px;
	border-radius:6px 6px 0 0;
	background-color: #666;
	color: #ccc;
	overflow: hidden;
	position: relative;
}

.tab_last { margin-right:0!important; float:right!important;}

ul.tabs li:hover {
	background-color: #ccc;
	color: #333;
}

ul.tabs li.active {
	background-color: #ddd;
	color: #333;
	border-bottom: 1px solid #fff;
	display: block;
}

.tab_container {
	border: 1px solid #333;
	border-top: none;
	clear: both;
	float: left;
	width: 100%;
	background: #fff;
	overflow: auto;
}

.tab_content {
	padding: 20px;
	display: none;
}

.tab_drawer_heading { display: none; }

@media screen and (max-width: 480px) {
	.tabs {
		display: none;
	}
	.tab_drawer_heading {
		background-color: #ccc;
		color: #fff;
		border-top: 1px solid #333;
		margin: 0;
		padding: 5px 20px;
		display: block;
		cursor: pointer;
		-webkit-touch-callout: none;
		-webkit-user-select: none;
		-khtml-user-select: none;
		-moz-user-select: none;
		-ms-user-select: none;
		user-select: none;
	}
	.d_active {
		background-color: #666;
		color: #fff;
	}
}

______________________________
JS
// tabbed content
    // http://www.entheosweb.com/tutorials/css/tabs.asp
    $(".tab_content").hide();
    $(".tab_content:first").show();

  /* if in tab mode */
    $("ul.tabs li").click(function() {
		
      $(".tab_content").hide();
      var activeTab = $(this).attr("rel"); 
      $("#"+activeTab).fadeIn();		
		
      $("ul.tabs li").removeClass("active");
      $(this).addClass("active");

	  $(".tab_drawer_heading").removeClass("d_active");
	  $(".tab_drawer_heading[rel^='"+activeTab+"']").addClass("d_active");
	  
    });
	/* if in drawer mode */
	$(".tab_drawer_heading").click(function() {
      
      $(".tab_content").hide();
      var d_activeTab = $(this).attr("rel"); 
      $("#"+d_activeTab).fadeIn();
	  
	  $(".tab_drawer_heading").removeClass("d_active");
      $(this).addClass("d_active");
	  
	  $("ul.tabs li").removeClass("active");
	  $("ul.tabs li[rel^='"+d_activeTab+"']").addClass("active");
    });
	
	
	/* Extra class "tab_last" 
	   to add border to right side
	   of last tab */
	$('ul.tabs li').last().addClass("tab_last");

Reference Links