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CSS

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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

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JavaScript

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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="wrapper">

  <div class="ui container">
    <h1 class="ui header">Minecraft Chat Preview</h1>
  </div>

  <div id="entry" class="ui container">
    <p class="ui header">Input</p>
    <div class="ui large fluid input">
      <input id="input" name="input" />
    </div>
  </div>

  <div id="render" class="ui container">
    <p class="ui header">Preview</p>
    <div id="preview" class="ui">
      <p id="output" class="fontsforweb_minecraftfont render"></p>
    </div>
  </div>

  <div id="reference" class="ui container">
    <div class="ui stackable grid render">

      <div class="ten wide column">
        <p class="ui header">Colors</p>
        <div id="codes">
          <div class="ui two column stackable grid">

            <div class="column">
              <div class="ui big list">
                <div class="item">&1 <span class="blue">blue</span></div>
                <div class="item">&2 <span class="green">green</span></div>
                <div class="item">&3 <span class="darkaqua">dark aqua</span></div>
                <div class="item">&4 <span class="red">red</span></div>
                <div class="item">&5 <span class="purple">purple</span></div>
                <div class="item">&6 <span class="orange">orange</span></div>
                <div class="item">&7 <span class="gray">gray</span></div>
                <div class="item">&8 <span class="darkgray">dark gray</span></div>
                <div class="item">&0 <span class="black">black</span></div>
              </div>
            </div>

            <div class="column">
              <div class="ui big list">
                <div class="item">&9 <span class="lightblue">light blue</span></div>
                <div class="item">&a <span class="lime">lime green</span></div>
                <div class="item">&b <span class="aqua">aqua</span></div>
                <div class="item">&c <span class="lightred">light red</span></div>
                <div class="item">&d <span class="pink">light purple</span></div>
                <div class="item">&e <span class="yellow">yellow</span></div>
                <div class="item">&f <span class="white">white</span></div>
              </div>
            </div>

          </div>
        </div>
      </div>

      <div class="six wide column">
        <p class="ui header">Formats</p>
        <div id="codes">
          <div class="ui big list">
            <div class="item">&k magic/obfuscated
              <span class="magic"></span>
            </div>
            <div class="item">&l <strong>bold</strong></div>
            <div class="item">&m <s>strikethrough</s></div>
            <div class="item">&n <u>underline</u></div>
            <div class="item">&o <em>italic</em></div>
          </div>
        </div>
      </div>

    </div>
  </div>

  <div class="ui container">
    <p class="right item">
      Background image by <a href="http://ivan2294.deviantart.com/" target="_blank">ivan2294</a> &diam; Pixel font via <a href="http://fontsforweb.com/font/show?id=1412" target="_blank">FontsForWeb</a>
    </p>
  </div>

</div>
<!-- Piwik -->
<script type="text/javascript">
  var _paq = _paq || [];
  _paq.push(['trackPageView']);
  _paq.push(['enableLinkTracking']);
  (function() {
    var u="//mrnrkt.com/panit/";
    _paq.push(['setTrackerUrl', u+'piwik.php']);
    _paq.push(['setSiteId', 5]);
    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
    g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
  })();
</script>
<noscript><p><img src="//mrnrkt.com/panit/piwik.php?idsite=5" style="border:0;" alt="" /></p></noscript>
<!-- End Piwik Code -->
!

CSS 

              
                body {
  background-image: url('https://sgray.neocities.org/assets/minecraft_tile_background_by_ivan2294.jpg');
}

.wrapper {
  background-color: rgba(110, 110, 110, 0.7);
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  padding-top: 2em;
}

a {
  color: #bdf;
}

a:hover {
  color: #cef;
}

.ui.container {
  margin-bottom: 2em;
}

#input,
#output {
  width: 100%;
}

#preview,
#codes {
  background-color: rgba(10, 10, 10, 0.6);
  border-radius: 3px;
}

#preview {
  color: #fff;
  font-size: 1.6em;
  min-height: 1.6em;
  width: 100%;
  padding: 0.1em 0.5em;
}

#codes {
  color: #ccc;
  padding: 0.9em 1.2em;
}

.render .blue {
  color: #00c;
}

.render .green {
  color: #090;
}

.render .darkaqua {
  color: #0aa;
}

.render .red {
  color: #b00;
}

.render .purple {
  color: #909;
}

.render .orange {
  color: #d60;
}

.render .gray {
  color: #999;
}

.render .darkgray {
  color: #555;
}

.render .lightblue {
  color: #66f;
}

.render .black {
  color: #000;
}

.render .lime {
  color: #0f0;
}

.render .aqua {
  color: #0ff;
}

.render .lightred {
  color: #f55;
}

.render .pink {
  color: #c0f;
}

.render .yellow {
  color: #ff0;
}

.render .white {
  color: #fff;
}
!

JS 

              
                var color = {
  '1': 'blue',
  '2': 'green',
  '3': 'darkaqua',
  '4': 'red',
  '5': 'purple',
  '6': 'orange',
  '7': 'gray',
  '8': 'darkgray',
  '9': 'lightblue',
  '0': 'black',
  'a': 'lime',
  'b': 'aqua',
  'c': 'lightred',
  'd': 'pink',
  'e': 'yellow',
  'f': 'white'
};

var input = $('#input');
var output = $('#output');
var append;

input.keyup(function() {
  render($(this).val());
});

function render(string) {
  append = '';
  output.html(replacers(string));
}

function replacers(string) {
  replaced = string
    .replace(/&([a-f0-9])/gi, setColor)
    .replace(/&k/gi, setMagic)
    .replace(/&l/gi, '<strong>')
    .replace(/&m/gi, '<s>')
    .replace(/&n/gi, '<u>')
    .replace(/&o/gi, '<em>')
    .replace(/&r/gi, resetFormat)
    .replace(/\\n/gi, '<br />');
  return replaced;
}

function setColor(match) {
  var value = color[match.substr(1, match.length)];
  addClose;
  return '<span class="' + value + '">';
}

function setMagic(match) {
  return '<span class="magic"></span>';
}

function getMagic() {
return Math.random().toString(16).substr(1,2).split('.').join("");
}

function runMagic() {
  $('.magic').text(getMagic);
  window.setTimeout(runMagic, 60);
};
runMagic();

function resetFormat(match) {
  addClose;
  return '</strong></s></u></em><span class="white">';
}

function addClose() {
  append = '</span>' + append;
}
!
999px

Console