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HTML

About HTML Preprocessors

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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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.

Add External Scripts/Pens

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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 

              
                <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/limonte-sweetalert2/6.6.5/sweetalert2.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/limonte-sweetalert2/6.6.5/sweetalert2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/2.4.1/core.js"></script>
<a href="#last">Hello</a>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Minus assumenda a unde voluptas sint eaque ab libero veritatis officia alias repellendus quae quos incidunt eveniet, maxime fugit magnam ut hic.</p>
<p>Omnis voluptatem tempore eaque in error temporibus veniam similique praesentium doloribus quod totam unde ullam, nihil veritatis facere. Aperiam placeat sequi hic autem fugit soluta sunt ullam est, voluptas tempore.</p>
<p>Ipsum dolorum autem labore, nesciunt eius ullam earum ipsa incidunt, distinctio sunt ea reiciendis optio tempore magni illum sit non repudiandae quaerat ex aspernatur perferendis nisi corporis eos. Atque, voluptatibus!</p>
<p>Libero quis laboriosam excepturi a aliquid. Esse necessitatibus tempore cumque dolores nostrum natus, nam, quisquam, fugit neque quaerat ipsum voluptate incidunt, doloremque assumenda voluptatum. Deleniti ipsam veritatis harum repellat temporibus.</p>
<p>Et quod dolores esse laboriosam asperiores quidem, nesciunt error iure fuga! Praesentium necessitatibus ea, nobis nesciunt quasi aspernatur, iste facere iusto ut! Voluptates voluptate numquam, porro provident cupiditate est aliquam.</p>
<p>Dolore molestias magni iusto aspernatur ut molestiae veniam aut facere unde, atque blanditiis ex, ea iste aperiam aliquam libero veritatis consequatur nihil, cupiditate minus. Reiciendis sit sed cum quidem repellendus!</p>
<p>Ad praesentium architecto, itaque repellendus fugit recusandae tempora ex hic? Libero, nulla cum nisi minus. Vitae, nobis! Nobis ex vel nostrum minus, iste saepe facere ipsum rerum, doloremque libero aut!</p>
<p>Repellat voluptas neque minus at accusantium odit corporis, quod obcaecati numquam minima, rem deserunt culpa, ullam voluptatibus laudantium debitis tempora, adipisci quidem ipsum nobis qui voluptates totam maiores? Culpa, doloribus!</p>
<p>Perferendis sit delectus rerum architecto vel ab id enim suscipit dolorem quas, doloremque est dolores earum quam vitae placeat alias atque labore magni ipsum corporis quo amet ea. Molestiae, nesciunt.</p>
<p>Dolor asperiores corporis doloremque, voluptatibus repellendus cum velit nostrum temporibus enim, ipsum alias eos provident aliquid magnam incidunt quidem placeat consectetur architecto esse officiis illo! Ipsum nulla amet asperiores consequuntur.</p>
<p>Assumenda impedit temporibus aliquid doloribus repudiandae. Et, ut nisi? Voluptates quo beatae sint, harum enim officiis optio tenetur perspiciatis, dolorum officia aspernatur culpa minus deserunt rerum, veritatis eveniet, facere magni.</p>
<p>Sit in, quis consequuntur accusamus quae doloribus, ducimus adipisci enim, placeat explicabo ullam magni dignissimos, rem harum id ex officiis veritatis suscipit blanditiis. Praesentium totam fugiat magni illo temporibus doloremque.</p>
<p>Molestiae repellendus iure a maxime, incidunt beatae delectus cum explicabo aliquid, doloremque dolorem voluptas recusandae! Maxime, minus? Quisquam pariatur, doloribus reiciendis tempora voluptas saepe, eum voluptatem sequi, perferendis corporis omnis.</p>
<p>Aut fuga, optio vel maiores numquam accusantium itaque id explicabo ipsa, hic. Eius ipsam velit atque culpa est at recusandae, minus iste beatae. Ab maiores est facere adipisci a dicta.</p>
<p id="last">Mollitia magnam reprehenderit maiores velit. Explicabo sint laborum laudantium, dolore commodi provident, libero atque ullam quos autem illum aspernatur architecto cum doloremque qui facilis voluptatibus soluta possimus saepe. Beatae, tempore?</p>
!

CSS
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JS 

              
                $(function () {
  $("a").click(function () {
    swal({
      title: 'If you know the hire code, please enter.',
      input: 'text',
      type: 'question',
      showCancelButton: true,
      confirmButtonText: 'Hire Me',
      cancelButtonText: 'Contact',
      inputValidator: function (value) {
        return new Promise(function (resolve, reject) {
          if (value) {
            resolve()
          } else {
            reject('You need to write something!')
          }
        })
      }
    });
  });
});
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999px

Console