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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                <div class="main-example">
<div class="countdown-container" data-timer="2030/09/05" id="main-example"></div>
</div>
<script type="text/template" id="main-example-template">
<div class="time <%= label %>">
  <span class="count curr top"><%= curr %></span>
  <span class="count next top"><%= next %></span>
  <span class="count next bottom"><%= next %></span>
  <span class="count curr bottom"><%= curr %></span>
  <span class="label"><%= label.length < 6 ? label : label.substr(0, 3)  %></span>
</div>
</script>
!

CSS 

              
                html, body {
  height: 100%;
}
  
body{
  background: $body_color;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Helvetica Neue;
  color: $text_color;
  
  > * {
    margin: auto;
  }
}

.main-example {
	margin: 0 auto;
	width: 355px;
	text-align: center;
}
.main-example .countdown-container {
	height: 130px;
}
.main-example .time {
	border-radius: 5px;
	box-shadow: 0 0 10px 0 rgba(0,0,0,0.5);
	display: inline-block;
	text-align: center;
	position: relative;
	height: 95px;
	width: 65px;

	-webkit-perspective: 479px;
	-moz-perspective: 479px;
	-ms-perspective: 479px;
	-o-perspective: 479px;
	perspective: 479px;

	-webkit-backface-visibility: hidden;
	-moz-backface-visibility: hidden;
	-ms-backface-visibility: hidden;
	-o-backface-visibility: hidden;
	backface-visibility: hidden;

	-webkit-transform: translateZ(0);
	-moz-transform: translateZ(0);
	-ms-transform: translateZ(0);
	-o-transform: translateZ(0);
	transform: translateZ(0);

	-webkit-transform: translate3d(0,0,0);
	-moz-transform: translate3d(0,0,0);
	-ms-transform: translate3d(0,0,0);
	-o-transform: translate3d(0,0,0);
	transform: translate3d(0,0,0);
}
.main-example .count {
	background: #202020;
	color: #f8f8f8;
	display: block;
	font-family: 'Oswald', sans-serif;
	font-size: 2em;
	line-height: 2.4em;
	overflow: hidden;
	position: absolute;
	text-align: center;
	text-shadow: 0 0 10px rgba(0, 0, 0, 0.8);
	top: 0;
	width: 100%;

	-webkit-transform: translateZ(0);
	-moz-transform: translateZ(0);
	-ms-transform: translateZ(0);
	-o-transform: translateZ(0);
	transform: translateZ(0);

	-webkit-transform-style: flat;
	-moz-transform-style: flat;
	-ms-transform-style: flat;
	-o-transform-style: flat;
	transform-style: flat;
}
.main-example .count.top {
	border-top: 1px solid rgba(255,255,255,0.2);
	border-bottom: 1px solid rgba(255,255,255,0.1);
	border-radius: 5px 5px 0 0;
	height: 50%;

	-webkit-transform-origin: 50% 100%;
	-moz-transform-origin: 50% 100%;
	-ms-transform-origin: 50% 100%;
	-o-transform-origin: 50% 100%;
	transform-origin: 50% 100%;
}
.main-example .count.bottom {
	background-image: linear-gradient(rgba(255,255,255,0.1), transparent);
	background-image: -webkit-linear-gradient(rgba(255,255,255,0.1), transparent);
	background-image: -moz-linear-gradient(rgba(255,255,255,0.1), transparent);
	background-image: -ms-linear-gradient(rgba(255,255,255,0.1), transparent);
	background-image: -o-linear-gradient(rgba(255,255,255,0.1), transparent);
	border-top: 1px solid #000;
	border-bottom: 1px solid #000;
	border-radius: 0 0 5px 5px;
	line-height: 0;
	height: 50%;
	top: 50%;

	-webkit-transform-origin: 50% 0;
	-moz-transform-origin: 50% 0;
	-ms-transform-origin: 50% 0;
	-o-transform-origin: 50% 0;
	transform-origin: 50% 0;
}
.main-example .count.next {
}
.main-example .label {
	font-size: normal;
	margin-top: 5px;
	display: block;
	position: absolute;
	top: 95px;
	width: 100%;
}
/* Animation start */
.main-example .count.curr.top {
	-webkit-transform: rotateX(0deg);
	-moz-transform: rotateX(0deg);
	-ms-transform: rotateX(0deg);
	-o-transform: rotateX(0deg);
	transform: rotateX(0deg);
	z-index: 3;
}
.main-example .count.next.bottom {
	-webkit-transform: rotateX(90deg);
	-moz-transform: rotateX(90deg);
	-ms-transform: rotateX(90deg);
	-o-transform: rotateX(90deg);
	transform: rotateX(90deg);
	z-index: 2;
}
/* Animation end */
.main-example .flip .count.curr.top {
	-webkit-transition: all 250ms ease-in-out;
	-moz-transition: all 250ms ease-in-out;
	-ms-transition: all 250ms ease-in-out;
	-o-transition: all 250ms ease-in-out;
	transition: all 250ms ease-in-out;

	-webkit-transform: rotateX(-90deg);
	-moz-transform: rotateX(-90deg);
	-ms-transform: rotateX(-90deg);
	-o-transform: rotateX(-90deg);
	transform: rotateX(-90deg);
}
.main-example .flip .count.next.bottom {
	-webkit-transition: all 250ms ease-in-out 250ms;
	-moz-transition: all 250ms ease-in-out 250ms;
	-ms-transition: all 250ms ease-in-out 250ms;
	-o-transition: all 250ms ease-in-out 250ms;
	transition: all 250ms ease-in-out 250ms;

	-webkit-transform: rotateX(0deg);
	-moz-transform: rotateX(0deg);
	-ms-transform: rotateX(0deg);
	-o-transform: rotateX(0deg);
	transform: rotateX(0deg);
}

.main-example {
	width: 100%;
}
.main-example .countdown-container {
	height: 100px;
}
.main-example .time {
	height: 70px;
	width: 48px;
}
.main-example .count {
	font-size: 1.5em;
	line-height: 70px;
}
.main-example .label {
	font-size: 0.8em;
	top: 72px;
}
!

JS 

              
                var labels = ['weeks', 'days', 'hours', 'minutes', 'seconds'],
	TimerCount = (new Date().getFullYear() + 1) + '/01/01',
	template = _.template( jQuery('#main-example-template').html()),
	currDate = '00:00:00:00:00',
	nextDate = '00:00:00:00:00',
	parser = /([0-9]{2})/gi,
	$example = jQuery('#main-example');

	if( $example.data("timer").length ){
		TimerCount = $example.data("timer");	
	}

// Parse countdown string to an object
function strfobj(str) {
	var parsed = str.match(parser),
		obj = {};
	labels.forEach(function(label, i) {
		obj[label] = parsed[i]
	});
	return obj;
}
// Return the time components that diffs
function diff(obj1, obj2) {
	var diff = [];
	labels.forEach(function(key) {
		if (obj1[key] !== obj2[key]) {
			diff.push(key);
		}
	});
	return diff;
}
// Build the layout
var initData = strfobj(currDate);
labels.forEach(function(label, i) {
	$example.append(template({
		curr: initData[label],
		next: initData[label],
		label: label
	}));
});
// Starts the countdown
$example.countdown(TimerCount, function(event) {
	var newDate = event.strftime('%w:%d:%H:%M:%S'),
		data;

	if (newDate !== nextDate) {
		currDate = nextDate;
		nextDate = newDate;
		// Setup the data
		data = {
			'curr': strfobj(currDate),
			'next': strfobj(nextDate)
		};
		// Apply the new values to each node that changed
		diff(data.curr, data.next).forEach(function(label) {
			var selector = '.%s'.replace(/%s/, label),
				$node = $example.find(selector);
			// Update the node
			$node.removeClass('flip');
			$node.find('.curr').text(data.curr[label]);
			$node.find('.next').text(data.next[label]);
			// Wait for a repaint to then flip
			_.delay(function($node) {
				$node.addClass('flip');
			}, 50, $node);
		});
	}
});
!
999px

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