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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>

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

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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.

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

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HTML 

              
                <!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Demo</title>
</head>

<body>
  <div class="wrapper">
    <div class="wrapper1">
      <div>默认行为</div>
      <p>
        Lorem ipsum dolor sit amet consectetur adipisicing elit. Officia dolore exercitationem, numquam esse aspernatur blanditiis excepturi mollitia expedita sit a perspiciatis. Facere mollitia recusandae minus numquam. Fugit nisi perspiciatis minus odio ea at nulla consectetur sequi eveniet rem iure expedita quam aspernatur officia in saepe facere deserunt et, illo impedit nemo quaerat labore earum! Aut molestias itaque quae molestiae quis nihil, consectetur ipsam. Qui dignissimos hic natus delectus doloremque repellat ratione possimus! Totam, consectetur dicta culpa reiciendis veniam cumque. Officia tempore perspiciatis explicabo corrupti placeat dolor ut voluptas earum qui quas voluptate ea commodi quibusdam sint nulla, itaque suscipit dolore quos? Laudantium consequatur aperiam voluptatibus accusantium commodi fuga! Quia, nemo nihil illum assumenda libero alias hic obcaecati reiciendis? Dolore adipisci eum, debitis ratione veniam ex magni culpa corporis deleniti libero ut officia, quas amet doloremque delectus blanditiis perferendis, aut id at. Veniam maxime nulla, minima ut unde totam obcaecati aliquid? Facilis sequi iusto, voluptate consectetur eum ipsum alias vitae tenetur eligendi praesentium earum beatae est quisquam dignissimos iste temporibus dolores. Alias officiis nobis adipisci quam possimus quos enim rem, cumque quidem deleniti corrupti eum eaque similique animi ex sequi, nemo nam beatae recusandae asperiores corporis atque? Ea ad praesentium sit?
      </p>
    </div>

    <div class="wrapper2">
      <div>阻止左滑返回</div>
      <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Aliquid, dolore impedit praesentium aperiam quasi neque blanditiis, eligendi, recusandae quisquam reiciendis repellendus nulla obcaecati exercitationem architecto sed omnis fugit molestiae voluptate repudiandae aspernatur! Maiores officiis deleniti error nostrum fugiat veritatis cum voluptatem ullam et, ipsa autem facere accusamus corporis non. Repellendus hic facilis a eligendi tempore, perferendis fugiat provident tenetur nostrum ullam voluptatum obcaecati vel dignissimos alias voluptas blanditiis quia dolorem beatae odio, ea placeat optio culpa? Distinctio obcaecati quo dicta quis, porro, voluptatem provident modi laudantium asperiores dolorum soluta ea eaque hic autem cum deleniti maiores quaerat! Repellendus, eos esse quod odit eligendi sed vel soluta nulla temporibus molestiae obcaecati voluptas? Blanditiis, ipsum. Cupiditate cum ipsum voluptates. Temporibus nemo aspernatur maxime soluta. Iusto quam dolorem aperiam in facere hic. Possimus vero quos tenetur perferendis ad quod inventore. Quas dicta quos maiores est maxime, dignissimos aliquid officiis hic, fugit laudantium nesciunt officia. Eligendi expedita architecto doloremque a natus perferendis iure rem dolor aperiam possimus cum repellat modi adipisci nostrum non, iste maxime porro eos at mollitia, vel autem? Ut id, culpa eveniet deleniti minima veritatis reiciendis at odio soluta, iure ab esse autem voluptatum itaque cumque mollitia ratione. Nulla, perferendis odit.</p>
    </div>
  </div>
</body>

</html>
!

CSS 

              
                .wrapper {
  display: flex;
  gap: 20px;
}
.wrapper1,
.wrapper2 {
  width: 300px;
  height: 300px;
  overflow: auto;
}
.wrapper1 {
  border: 2px solid #c90;
}
.wrapper2 {
  border: 2px solid #9c0;
  overscroll-behavior-x: none;
}
p {
  width: 500px;
}
!

JS
!
999px

Console