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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CSS Preprocessors- The future of CSS</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="css/reveal.min.css">
<link rel="stylesheet" href="css/theme/default-znja.css" id="theme">
<!-- For syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- If the query includes 'print-pdf', include the PDF print sheet -->
<script>
if( window.location.search.match( /print-pdf/gi ) ) {
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = 'css/print/pdf.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
}
</script>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Slide 1 -->
<div class="slides">
<section>
<h1>CSS Preprocessors</h1>
<h3>LESS CSS is more SASSy.</h3>
<p>
<small>Created by <a href="http://github.com/znja" target="_blank">Carlos Corvaia</a> from Egov </small>
</p>
<div class="logos">
<img src="imgs/less-logo.png" > <img src="imgs/sass-logo.png" >
</div>
</section>
</div>
<!-- END OF SLIDE 1 -->
<!-- SLIDE 2 -->
<div class="slides">
<section>
<!-- Sub Slide 1 -->
<section>
<h2>I will talk about</h2>
<ul>
<li>CSS Weaknesses</li>
<li>Preprocessors Features</li>
<li>Misconseptions</li>
</ul>
</section>
<!-- Sub Slide 2 -->
<section>
<h2>Ready to feel like this?</h2>
<img class="fragment" src="http://i.imgur.com/mJMj0.gif">
</section>
</section>
</div>
<!-- END OF SLIDE 2 -->
<!-- SLIDE 3 -->
<div class="slides">
<section>
<!-- Sub Slide 1 -->
<section>
<h1>CSS Weaknesses</h1>
</section>
<!-- Sub Slide 2 -->
<section>
<h2>Lack of variables</h2>
<p> CSS Variables exist in new webkits, but we wont be able to see them until IE 7,8,9,10 usage drop below 1%. We know when that is going to happen right?</p>
</section>
<!-- Sub Slide 3 -->
<section>
<h2>Working with multiple files</h2>
<p class="fragment"> Having multiple files is good for collaboration and maintainability and this can be done in CSS with the <code>@import</code> but with a high cost.</p>
<p class="fragment"> Additional HTTP requests (NO one wants more of those)</p>
</section>
<!-- Sub Slide 4 -->
<section>
<h2>HUGE messy CSS files</h2>
<p>Hard to maintain, even for awesome CSS masters hackysak ninja that comment block their CSS.</p>
<p>Not DRY enough.</p>
<p class="fragment">D = DON'T</p>
<p class="fragment">R = REPEAT</p>
<p class="fragment">Y = YOURSELF</p>
</section>
<!-- Sub Slide 5 -->
<section>
<h2>Preprocessors are here to help</h2>
<p class="fragment">How?</p>
<img class="fragment" src="imgs/gifs/magic.gif">
</section>
<!-- Sub Slide 5 -->
<section>
<h2>Disclamer!</h2>
<p>Before you go Super Saiyan on me</p>
<img src="imgs/gifs/ss2.gif">
<p>Preprocessors do NOT enhance CSS, but what they will do is improve your development workflow</p>
</section>
</section>
</div>
<!-- END OF SLIDE 3 -->
<!-- SLIDE 4 -->
<div class="slides">
<section>
<!-- Sub Slide 1 -->
<section>
<h1>Preprocessors features</h2>
</section>
<!-- Sub Slide 2 -->
<section>
<ol>
<li>Variables</li>
<li>Operations and Color Functions</li>
</ol>
</section>
<!-- Sub Slide 3 -->
<section>
<p>These features work on both SASS and LESS</p>
</section>
</section>
</div>
<!-- END OF SLIDE 4 -->
<!-- SLIDE 5 -->
<div class="slides">
<section>
<!-- Sub Slide 1 -->
<section>
<h2>Variables</h2>
<pre><code data-trim contenteditable>
$my_awesome_blue: #001F3F; //SASS
@my_awesome_blue: #001F3F; //LESS
$primary_color: $my_awesome_blue;
h1 {
color: $primary_color;
}
</code></pre>
</section>
<!-- Sub Slide 2 -->
<section>
<h2>Variable Types</h2>
<p>Variables don't have be just colors</p>
<pre><code data-trim contenteditable>
$fonts: Helvetica, Arial, sans-serif;
$images_path: "../img/";
$font-size: 1.5em;
$margin: 20px;
$width: 1000px;
</code></pre>
</section>
</section>
</div>
<!-- END OF SLIDE 5 -->
<!-- SLIDE 6 -->
<div class="slides">
<section>
<!-- Sub Slide 1 -->
<section>
<h2>Operations and color functions</h2>
<h4>Math and colors operations</h4>
<pre><code data-trim contenteditable>
width: $width / 2 ; // = 500px
</code></pre>
<h4>Color Functions</h4>
<pre><code data-trim contenteditable>
$light_blue: lighten($my_awesome_blue, 20%);
$invert_blue: invert($my_awesome_blue, 20%);
</code></pre>
</section>
</section>
</div>
<!-- END OF SLIDE 6 -->
<!-- SLIDE 7 -->
<div class="slides">
<section>
<!-- Sub Slide 1 -->
<section>
<h2>MIXINS</h2>
<p>Mixins don't return anything but output CSS</p>
<p>Functions like lighten() return values</p>
<pre><code data-trim contenteditable>
@mixin border-radius($radius: 10px){
-webkit-border-radius: $radius;
-moz-border-radius: $radius;
border-radius: $radius;
}
.button {
...
@include border-radius(4px);
}
</code></pre>
<p>Will output: </p>
<pre><code data-trim contenteditable>
.button {
...
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
}
</code></pre>
</section>
</section>
</div>
<!-- END OF SLIDE 7 -->
<!-- SLIDE 8 -->
<div class="slides" >
<section>
<!-- Sub Slide 1 -->
<section>
<h2>NESTING</h2>
<pre><code data-trim contenteditable>
.preprocessor {
.is-awesome {
...
&:hover {
...
}
}
}
// ======= Output ========
.preprocessor {}
.preprocessor .is-awesome {}
.preprocessor .is-awesome:hover {}
</code></pre>
<p>Don't over nest (4 level max)</p>
</section>
</section>
</div>
<!-- END OF SLIDE 8 -->
<!-- SLIDE 9 -->
<div class="slides" >
<section>
<!-- Sub Slide 1 -->
<section>
<h2>Imports and minification</h2>
<p>Imports now work with no performance costs!</p>
<img src="imgs/gifs/excited.gif">
<p>Exciting right?</p>
</section>
<section>
<h2>How?</h2>
<p>Just import them and let the preprocessor stitch your CSS together</p>
<pre><code data-trim contenteditable>
@import "colors";
@import "typography";
@import "layouts";
</code></pre>
<p>It can also output a clear or minified version of your CSS</p>
</section>
</section>
</div>
<!-- END OF SLIDE 9 -->
<!-- SLIDE 10 -->
<div class="slides" >
<section>
<!-- Sub Slide 1 -->
<section>
<h1>Misconceptions</h1>
</section>
<section>
<h2>"I need ruby or node backend"</h2>
<p>SASS is written in Ruby</p>
<p>LESS is written in Javascript</p>
<p>This does NOT mean you need ruby or node on your production server to use them.</p>
<p>You need them on your development machine</p>
</section>
<section>
<h2>Less Runs client-side</h2>
<p>Less can run client-side, But NEVER use it in production.</p>
<p>It is OK for quick testing or to complile in-browser if you can't access your dev environment.</p>
</section>
<section>
<h2>It is hard to install</h2>
<p>Both Ruby and Node are easy to install on any platform</p>
<p>Mac: Ruby is pre-installed, Node.pkg</p>
<p>Windows: RubyInstaller.exe, Node.exe</p>
</section>
</section>
</div>
<!-- END OF SLIDE 9 -->
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.min.js"></script>
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Reveal.initialize({
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center: true,
theme: Reveal.getQueryHash().theme, // available themes are in /css/theme
transition: Reveal.getQueryHash().transition || 'default', // default/cube/page/concave/zoom/linear/fade/none
// Parallax scrolling
// parallaxBackgroundImage: 'https://s3.amazonaws.com/hakim-static/reveal-js/reveal-parallax-1.jpg',
// parallaxBackgroundSize: '2100px 900px',
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