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HTML

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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

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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 

              
                <script type="text/javascript">
  var lock = !![]
  /*
  true = !![]
  false = ![]
  */
</script>
<div id="alert">NOT AUTHORIZED</div>
<h1>Heading</h1>
<p>High Life locavore Vice, viral put a bird on it banjo cred +1 pickled chambray beard. Dreamcatcher Pitchfork Cosby sweater keytar. PBR&B pork belly pug, Godard direct trade organic bitters craft beer butcher XOXO small batch Pinterest. Master cleanse direct trade trust fund, forage wolf typewriter pour-over hashtag flannel pug leggings yr actually. DIY cray chia farm-to-table small batch, 3 wolf moon bespoke. Forage letterpress swag, fanny pack 8-bit Portland authentic ethnic pickled occupy vegan gentrify PBR chillwave. Pickled four loko dreamcatcher, Pitchfork swag before they sold out single-origin coffee.

Authentic Odd Future VHS, chia organic forage fashion axe paleo wayfarers. Next level Williamsburg fingerstache pour-over Pitchfork. Butcher forage freegan flexitarian keytar disrupt, single-origin coffee retro. Lomo butcher ugh +1, Tumblr DIY McSweeney's polaroid Terry Richardson before they sold out Portland try-hard Bushwick. Intelligentsia cliche you probably haven't heard of them, fashion axe Marfa iPhone Portland McSweeney's High Life synth Carles wolf try-hard Banksy. Wolf XOXO fixie selfies. 90's trust fund kale chips, fixie retro Bushwick sartorial.

Bicycle rights fanny pack blog, twee paleo pour-over quinoa PBR&B Blue Bottle YOLO ugh single-origin coffee Carles Odd Future. Hoodie tofu mustache, quinoa direct trade tote bag twee gluten-free skateboard letterpress. Viral readymade fashion axe iPhone, leggings pop-up tousled keffiyeh whatever 90's before they sold out gentrify. Aesthetic Schlitz 3 wolf moon, mustache fingerstache ethnic actually polaroid iPhone food truck. Jean shorts asymmetrical Marfa kitsch, authentic chambray cred banjo dreamcatcher typewriter scenester. Before they sold out banjo ethical Terry Richardson. Marfa literally selvage butcher cred Shoreditch.

Schlitz pickled roof party, Tonx typewriter pug Marfa synth chillwave stumptown. Helvetica raw denim Blue Bottle forage. Mlkshk actually skateboard, yr scenester XOXO cardigan Austin small batch fashion axe Thundercats occupy synth lomo. Pitchfork sustainable chillwave yr banh mi beard, occupy bespoke fanny pack blog Cosby sweater pork belly brunch tote bag Portland. Godard disrupt scenester Blue Bottle pug Austin, tattooed literally. Gluten-free polaroid Echo Park readymade distillery leggings. Art party stumptown Tonx Brooklyn, deep v vinyl letterpress roof party Godard forage.
<!-- http://hipsteripsum.me/ -->
</p>
!

CSS 

              
                #alert{
  position:absolute;
  z-index:12;
  width:12em;
  height:6em;
  background:#fff;
  margin:32vh auto;
  left:0;right:0;
  text-align:center;
  line-height:6.6;
  box-shadow:0 0 0 1000000em rgba(0,0,0,.8);
  display:none;
  animation:move 30s linear;
}

@keyframes move{
  0%{}
  5%{left:-15em;}
  10%{top:-10em;}
  15%{left:18em;}
  20%{top:14em;}
  25%{left:-20em;}
  30%{left:5em;}
  35%{top:9em;}
  40%{right:2em;}
  45%{bottom:2em;}
  50%{top:12em;}
  55%{}
  60%{left:-15em;}
  65%{top:-10em;}
  70%{left:18em;}
  75%{top:14em;}
  80%{left:-20em;}
  85%{left:5em;}
  90%{top:9em;}
  95%{right:2em;}
  100%{left:0;right:0;top:30vh}
}
!

JS 

              
                $(document).ready(function(){var e="b",t="o",n="d",r="y",i="e";if(lock==!![])$(e+t+n+r).css(e+"ackgroun"+n,"re"+n).find("#alert").fadeIn();else $(e+t+n+r).css(e+"ackgroun"+n,"gr"+i+"en")});
!
999px

Console