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

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HTML 

              
                    <div class="wired">
Lorem ipsum dolor sit amet, utinam aeterno no est. Erat graeco legendos ex quo, in per latine accusam. Ad accumsan praesent eum, no mea expetenda constituam, duis essent ceteros ut sea. Id illum offendit incorrupte pro, verear vidisse sea an. Eum adhuc velit an.<br><br>

Et liber consectetuer sed, ex viderer efficiendi dissentiet cum. Cu cum ridens labores expetenda, an mei eripuit deserunt. Rationibus vituperata at sea. <a href="#">Eu quo rebum iuvaret recusabo </a>. Has sonet diceret denique ei, mei an magna habeo omnes. Salutandi conclusionemque pro in.<br><br>

Diam soleat quo ne, omnesque intellegat at nec. Eum melius officiis consectetuer id, in laoreet qualisque vis, oratio facilisi sed te. Ex ius inani urbanitas vulputate, dico laboramus duo no, sed ex postea labore dolorem. Efficiendi signiferumque nam et. Integre feugiat blandit mei te. Clita percipit democritum vis at, no mea odio primis.
    </div>
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CSS 

              
                .wired {
  position: absolute;
  top: 30px;
  left: 30px;
  right: 30px;
  bottom: 30px;
  text-align: left;
  font-family: serif;
  font-size: 18px;
  line-height: 28px;
  color: #000;
}

.wired a {
  border-bottom: 3px solid #b4e7f8;
  box-shadow: inset 0 -5px 0 #b4e7f8;
  color: #000;
  text-decoration: none;
  background: none;
  transition: all 300ms ease-in-out;
  -moz-transition: all 100ms ease-in-out;
  -webkit-transition: all 100ms ease-in-out;
}

.wired a:hover {
  background: #b4e7f8;
}
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JS
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999px

Console