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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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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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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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.

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

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HTML 

              
                	<div class="wrap">
		<div class="cookiepopUp">
			<p>Hi, I'm a cookie popup, with blur on the background!</p>
		</div>
		
		<div class="main main--blurred">
			<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Est perspiciatis voluptates earum alias obcaecati sapiente neque vitae sunt eum accusamus quae nostrum consequuntur ad illo ratione nemo expedita porro unde.</p>
			<img class="kittennn" src="http://placekitten.com/200/300" alt=""><p>Neque assumenda distinctio illum reprehenderit quod mollitia sunt ratione architecto beatae voluptatibus repellat autem vel at. Illo autem dicta voluptate similique mollitia saepe maiores placeat perspiciatis assumenda sapiente ipsam quaerat?</p>
			<p>Nesciunt natus aliquid tenetur blanditiis unde cumque inventore officia aspernatur aperiam sint excepturi hic provident ducimus laudantium sit maxime officiis libero laboriosam vero distinctio quis tempora nulla suscipit quidem nisi.</p>
			<p>Sequi ab facilis officia quidem rem cum ullam libero labore iure deleniti! Dolorum repellat vel tempore ab et deleniti architecto! Blanditiis consectetur quam harum officiis maiores quibusdam excepturi repellat provident.</p>
			<p>Sint illo molestiae a quisquam alias adipisci minima rerum quidem animi numquam consectetur quo officia harum laudantium autem fugiat mollitia quod molestias nemo aperiam. Nobis similique harum quae perspiciatis reiciendis!</p>
			<p>Quisquam deleniti neque maiores dicta perspiciatis aliquam pariatur excepturi blanditiis ea est quo distinctio et ducimus officia nam ut laborum cupiditate repellendus fugiat numquam reiciendis natus voluptatibus error consequuntur ipsa!</p>
			<p>Accusamus minima aliquid autem cumque soluta asperiores perferendis! Doloremque veniam aspernatur blanditiis nulla deleniti sequi corrupti neque tenetur mollitia error quisquam assumenda minus iure maiores eius labore eaque nihil iste.</p>
			<p>Deleniti consectetur asperiores quae quam ipsa fuga neque dolorem perferendis nulla modi quisquam voluptate sapiente tenetur blanditiis odio sed veritatis! Error praesentium eius reprehenderit ullam recusandae necessitatibus optio sed atque?</p>
		</div>
	</div>
!

CSS 

              
                .main--blurred {
  filter: blur(5px); /* Add blur filter */
  user-select: none; /* Make sure user cannot select anything on the page */
  pointer-events: none; /* Make sure user cannot use page */
}


body{ padding:50px; text-align:center; }
img{ margin:50px 0 0 0; }
.main img.kittennn{
  float: right;
}
.wrap{
  width: 800px;
}
.cookiepopUp{
  background-color: #fff;
  border: 2px dashed;
  height: 200px;
  left: 300px;
  margin: 0 auto;
  overflow: hidden;
  position: fixed;
  top: 100px;
  width: 400px;
  z-index: 1;
}
!

JS
!
999px

Console