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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-.

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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

Add Packages

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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About Packages

Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <p>Atqui clita prompta eum an, an mundi nusquam sit. Movet consequat sit eu, ne pri equidem pericula principes, in vim etiam audiam. Qui ne munere mandamus expetenda. Saperet gloriatur vel ea, an sit quas aliquam lobortis. Lorem referrentur definitionem id mel, mel augue luptatum complectitur at. Erant suavitate vel ut.
<blockquote class="pullquote">
  The concept of generated content can be slippery to grasp, primarily because it may be considered outside the central purpose of <br>CSS.
</blockquote>

<p>At ius nobis omittantur, ei sed homero efficiantur contentiones, per harum discere et. Sonet molestie te nec, reque homero tamquam id vix, erat volumus ea eam. Et sumo reprehendunt eum, eam in latine eripuit, essent habemus et nam. Vim sumo case ea. Probo elitr ceteros at qui. An sit natum epicurei, vis mucius utroque splendide at, dicta bonorum persecuti eam ad. Et mea eruditi indoctum iudicabit, cu vero omittam concludaturque pro, alienum invidunt tacimates ex usu.

<p>Persius blandit adipisci mei cu, qui ea alia solum putent. Te delectus conceptam mel, et eius veniam mea. Id mei quas idque tation, pro eu tamquam vocibus. Te omnis dolor consul his, et exerci consul vivendo ius, ex habeo voluptatum duo. Est id scaevola mediocrem, pro ea amet libris altera.

<p>Ad duo veritus signiferumque. Nec ut laudem admodum. Nonumes constituto reprehendunt pri ea, mei simul affert id. Id duo omittam definitiones, qui periculis contentiones ei. Eum nemore disputationi voluptatibus ex, pro dolore dolores periculis ut.

<p>Putant offendit invidunt an his, atqui periculis cum et. Eros phaedrum pertinax cu sed, in vim fastidii percipit. Noster gloriatur reprehendunt has et. Et his latine scripta postulant, vix eu velit dolorum, sed salutandi iudicabit te. In nam malis nemore latine.
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CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Questrial);
body { 
  margin: 3rem;
  font-family: Georgia, serif;
  font-size: 1.4rem;
line-height: 1.5;
}
.pullquote {
  padding: 2.6rem 2.2rem 2rem 3.6rem;
  width: 20rem;
  position: relative;
  margin: 0 2rem 2rem 0;
  float: left;
  font-family: Questrial, Helvetica, sans-serif;
  font-size: 1.8rem;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  color: #FFF;
  text-transform: uppercase;
  background: #2F2F2F;
  border: 1px solid #eee;
  box-shadow: 0 0 5px #2F2F2F
}
.pullquote br { display: none; }
.pullquote:before, .pullquote:after { 
  content: "“";
  font-family: Georgia;
  font-size: 400%;
  position: absolute;
  color: yellow;
  text-shadow: 0 0 5px rgba(0,0,0,0.4);
}
.pullquote:before { 
  top: .25rem;
  left: .5rem;
}
.pullquote:after { 
  content: "”";
  bottom: -3rem;
  right: 3rem;
}
@media screen and (max-width: 700px)
  { 
.pullquote { 
  float: none;
  width: 80%;
margin: 0 auto;
}
.pullquote br { display: block; }
  }
@media screen and (max-width: 550px) { 
.pullquote br { display: none; }
}
@media screen and (max-width: 480px) { 
.pullquote:before, .pullquote:after { font-size: 200%; }
.pullquote { 
  font-size: 1.4rem;
  padding: 1.6rem 1.2rem 1rem 2rem;
}
.pullquote:after { bottom: 0; }
}
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JS
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999px

Console