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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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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-.

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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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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

              
                <!-- https://i.imgur.com/bbuESjz.jpg -->

<div class="slide">
  <div class="slide-img">
    <img src="https://images.unsplash.com/photo-1423882503395-8571951e45cc?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&w=1080&fit=max&s=f011230f831dba2833a69d7d55a02c20" alt="" />
  </div>
  <div class="slide-body">
    <span class="slide-title">Brilliant Headline</span>
    <span class="slide-text">I on to all taken indeed this happiness their narrow fate person, finds as without very a uniforms, and throughout. Publication cons, the from to bed must place thoroughly, hazardous as to importance, the would been made, then odd fundamentals he to your slight pointing, with pointing and to that.</span>
  </div>
</div>
!

CSS 

              
                // Edit these settings to play with the effect

$img-tolerance: 80px;    // amount the image should hang off the edges (crop)
$img-aspect-ratio: 16/9; // aspect ratio of image container
$duration: 15s;          // how long the ken burns pan lasts

*,*::before,*::after{box-sizing:border-box;}

body {
  font-family:sans-serif;
  padding-top:30px;
  line-height:1.5;
}

.slide {
  width:40%;
  margin:0 auto;
  background-color: #fff;
  box-shadow: 0 1px 5px rgba(0,0,0,.25);
}

.slide-img {
  overflow:hidden;
  position:relative;
  
  &::before {
    content: "";
    display: block;
    padding-bottom: (1 / $img-aspect-ratio) * 100%;
  }
  
  img {
    width: calc(100% + #{$img-tolerance});
    position: absolute;
    top: 50%;
    left: 50%;
    height: auto;
    transform: translateX(-50%) translateY(-50%);
    animation: kenburnsEffect $duration infinite;
    animation-timing-function: linear;
    animation-direction: alternate;
    
    // decreases jankiness
    backface-visibility:hidden;
  }
}

@keyframes kenburnsEffect {
  0% {
    transform:translateX(-50%) translateY(-50%) scale(1);
  }
  100% {
    transform:translateX(-55%) translateY(-30%) scale(1.35);
  }
}

.slide-body {
  padding:6%;
  
  [class*="slide"] {
    display:block;
  }
}

.slide-title {
  font-size: 2rem;
  font-weight:bold;
  margin-bottom:1rem;
}

.slide-text {
  font-size: 1rem;
}
!

JS
!
999px

Console