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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

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About the <head>

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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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HTML 

              
                <div class="panel"><h3>Playing with CSS columns</h3>
		<label>column-count</label>
		<input type="range" min="1" max="15" class="updater" data-change="column-count" value="6" />

		<label>column-gap </label>
		<input type="range" min="0" max="40" step=".1" class="updater" data-change="column-gap" value="22" />
		<select class="updater column-gap-unit" data-change="column-gap">
				<option>em</option>
				<option>mm</option>
				<option>vw</option>
				<option selected="selected">px</option>
		</select>

		<label>column-rule-width</label>
		<input type="range" min="0" max="40" class="updater" data-change="column-rule-width" value="3" />
		<select class="updater column-rule-width-unit" data-change="column-rule-width">
				<option>em</option>
				<option>mm</option>
				<option>vw</option>
				<option selected="selected">px</option>
		</select>

		<label>column-rule-style</label>

		<select class="updater" data-change="column-rule-style">
				<option>dashed</option>
				<option selected="selected">double</option>
				<option>dotted</option>
				<option>groove</option>
				<option>solid</option>

		</select>

			<label>column-break-before</label>
		<select class="updater" data-target=".header" data-change="column-break-before">
				<option>auto</option>
				<option selected="selected">initial</option>
				<option>always</option>
				<option>avoid</option>
				<option>left</option>
				<option>right</option>
			<option>recto</option>

		</select>
	
			<select class="dummyImageProvider">
				<option value="http://lorempixel.com/%w%/%h%">lorempixel.com</option>
				<option value="http://dummyimage.com/%w%x%h%">dummyimage.com</option>
				<option value="http://lorempizza.com/%w%x%h%">lorempizza.com</option>
								<option value="http://placekitten.com/%w%/%h%">placekitten.com</option>
				<option  value="http://placebeyonce.com/%w%-%h%">Boyonce</option>
				<option selected="selected" value="http://placebeard.it/%w%/%h%/notag">placebeard.it</option>

		</select>
	
</div>
<div class="title"><h1>CSS based columns </h1><small>P.s.: You may edit the dummy content</small></div>
		<pre>CSS:	<div class="css"></div></pre>
<div class="output" contenteditable="true">

</div>


<!-- UNDER CONSTRUNCTION START -->
<div id="banner"><a href="">Updated 11/9/15</a></div>
<style type="text/css">
/* RELATED TO UNDER CONSTRUCTION ONLY */
#banner{
      height: 149px;
			width: 149px;
			overflow:hidden;
			padding: 0;
			margin: 0;
  position: fixed;
  right: 0px;
  top: 0px;
}
#banner a{
	
	display: block;
	width: 200px;
	font-size: 14px;
	font-family: Frutiger, "Frutiger Linotype", Univers, Calibri, "Gill Sans", "Gill Sans MT", 
		"Myriad Pro", Myriad, "DejaVu Sans Condensed", "Liberation Sans", "Nimbus Sans L", Tahoma, 
		Geneva, "Helvetica Neue", Helvetica, Arial, sans serif;
	background-color: #333;
	color: #FFF;
	word-spacing: 2px;
	text-decoration: none;
	padding: 5px 15px 5px 25px;
	
	position:relative;
	left: 20px;
	top: -37px;
	text-align: center;
	
	-moz-transform-origin: 0 0 ;
	-moz-transform:rotate(45deg);
	-moz-box-shadow:    1px 1px 5px 1px #666;
	
	-webkit-transform-origin: 0 0 ;	
	-webkit-transform:rotate(45deg);
	-webkit-box-shadow: 1px 1px 5px 1px #666;
	
	-ms-transform-origin: 0 0 ;	
	-ms-transform:rotate(45deg);
	-ms-box-shadow: 1px 1px 5px 1px #666;
	
	transform-origin: 0 0 ;	
	transform:rotate(45deg);
	box-shadow: 1px 1px 5px 1px #666;
	
	background-image: linear-gradient(bottom, #000000 3%, #666666 5%, #000000 7%, #000000 93%, #666666 95%, #000000 97%);
	background-image: -o-linear-gradient(bottom, #000000 3%, #666666 5%, #000000 7%, #000000 93%, #666666 95%, #000000 97%);
	background-image: -moz-linear-gradient(bottom, #000000 3%, #666666 5%, #000000 7%, #000000 93%, #666666 95%, #000000 97%);
	background-image: -webkit-linear-gradient(bottom, #000000 3%, #666666 5%, #000000 7%, #000000 93%, #666666 95%, #000000 97%);
	background-image: -ms-linear-gradient(bottom, #000000 3%, #666666 5%, #000000 7%, #000000 93%, #666666 95%, #000000 97%);
	
	background-image: -webkit-gradient(
		linear,
		left bottom,
		left top,
		color-stop(0.03, #000000),
		color-stop(0.05, #666666),
		color-stop(0.07, #000000),
		color-stop(0.93, #000000),
		color-stop(0.95, #666666),
		color-stop(0.97, #000000)
	);	
	
}
</style>
<!-- UNDER CONSTRUNCTION END -->
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Inconsolata:400,700|Open+Sans:400,800);
body {
		font-family: 'Open Sans', sans-serif;
		font-size: 90%;
		padding: 0 10px;
		margin: 0;

}

.panel {
		opacity: .84;
		position: fixed;
		bottom: 0;
		left: 0;
		box-shadow: 0 0 10px black;
		z-index: 2;
		background: rgba(255, 255, 255, .93);
		width: 100%;
		padding: 6px;
		transition: all .4s .2s;
}

.panel:hover {
		opacity: 1;
		bottom: 0;
		transition: all .4s .1s;
}

.panel h3 {
		color: #009;
		margin: 0 0 5px;
		display: inline-block;
		border-right: solid 2px #00a;
		padding-right: 5px;
}

.panel label,
.css {
		font-family: 'Inconsolata', monospace;
}

.output {
	column-rule: 1px solid #ccc;
		column-fill: auto;
		column-count: 6;
		font-size: 80%;
		column-width: auto;
		column-gap: 2em;
		height: 400px;
}

.output img {
		width: 80%;
		max-height: 100px;
		margin: 10px 20% 5px 0%;
		max-width: 400px;
}

.header:first-letter {
		text-transform: uppercase;
}

.header {
		margin-top: 0;}

pre {
		font-weight: bold;
		font-size: 12pt;
}

.css {
		display: inline;
	font-size: smaller;
}

.css span {
		padding-right: .5em;
		font-weight: normal;
}
h1, h2, h3, h4, h5, h6 {
	color: #222;
}
.title * {
display: inline-block;
	height: .25em;
}
.title small {
	margin-left: 1em;
}
!

JS 

              
                var dummyImageProvider = "";
$(function() {
		getBaconIpsum();
		dummyImageProvider = $(".dummyImageProvider").val();
		$(".dummyImageProvider").on("change", function() {
				dummyImageProvider = $(".dummyImageProvider").val();
getBaconIpsum();
		});
		$(".panel").on("change touchend touchstart", setValues);
		setValues();

});

function setValues() {
		var css = "";
		$(".updater").each(function() {
				var $this = $(this);
				var property = $this.data("change");
				if (typeof property !== "undefined") {
						var target = $this.data("target") || ".output";
						var unit = $("." + property + "-unit").val() || "";
						var prop = PrefixFree.prefixProperty(property);
						if (this.value != unit) {
								var val = this.value + unit;
								css += "<span>" + prop + ": " + val + ";</span>";
								$(target).css(prop, val);
						}
				}
		});
		$(".css").html(css);
}

function getBaconIpsum() {
		$.getJSON('https://baconipsum.com/api/?callback=?', {
						'type': ((Math.random() > .5) ? 'meat-and-filler' : 'all-meat'),
						'start-with-lorem': '1',
						'paras': '15'
				},
				function(baconGoodness) {
						if (baconGoodness && baconGoodness.length > 0) {
								$(".output").html('');
								for (var i = 0; i < baconGoodness.length; i++) {
										var sHeader = "";
										if (Math.random() > .4 || i === 0) {
												var htype = parseInt(Math.random() * 4) + 1;
												var header = baconGoodness[i].split(" ");
												var noOfWords = parseInt(Math.random() * 10) + 2;
												var wStart = parseInt(Math.random() * (header.length - noOfWords));
												sHeader = "<h" + htype + " class=\"header\">";
												for (var ii = wStart; ii < wStart + noOfWords; ii++) {
														sHeader += header[ii].replace(/[\.,]/ig, "") + " ";
												};
												sHeader += "</h" + htype + ">";
										}
										var text = baconGoodness[i].split(" ");
										text = addImage(text).join(" ");
										$(".output").append(sHeader + '<p>' + text + '</p>');
								}
						}
				});
}

function addImage(arr) {
		var width = parseInt(Math.random() * 6) * 40 + 80;
		var height = parseInt(Math.random() * 6) * 40 + 40;
	var errSrc = "http://dummyimage.com/"+width+"/"+height+"/";
	var src = ("<img src='"+dummyImageProvider+"' style=\"min-width: %w%px; min-height: %h%px\" onerror=\"src=\'"+errSrc+"\'\" />").replace(/%w%/g, width).replace(/%h%/g, height);
		arr.splice(Math.random() * arr.length, 0, src);
		return arr;
}
!
999px

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