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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

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML

            
              <div class="container">
 <img
  srcset="https://freshman.tech/assets/dist/images/star-640.jpg 640w,
    https://freshman.tech/assets/dist/images/star-960.jpg 960w,
    https://freshman.tech/assets/dist/images/star-1200.jpg 1200w,
    https://freshman.tech/assets/dist/images/star-1440.jpg 1440w"
  sizes="(max-width: 799px) calc(100vw - 40px),
    (min-width: 800px) 800px"
  src="https://freshman.tech/assets/dist/images/star-960.jpg"
  alt="A star fish in water">
  
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Fuga odio repudiandae corrupti eaque accusamus. Qui rem nesciunt provident exercitationem facilis!</p>
  <p>Deserunt facilis, dicta reiciendis quo nobis praesentium sequi consequuntur voluptas alias quis accusamus unde? Molestiae pariatur quibusdam a optio facere.</p>
  <p>Porro quae sequi omnis soluta rem? Veritatis nobis magni commodi nostrum repudiandae deleniti voluptatem laboriosam voluptatibus? Dolorum quibusdam laudantium corrupti.</p>
  <p>Sequi voluptas deleniti, repellat expedita nihil magni recusandae, molestiae reprehenderit, officiis at maxime. Ad placeat impedit molestiae quis nobis libero!</p>
  <p>Nisi excepturi ut id, numquam officiis, ab, beatae laudantium quidem molestias iste neque nobis architecto rerum. Laudantium illum provident explicabo!</p>
  <p>Unde autem iste corporis. Animi dolor perspiciatis corrupti ea voluptas voluptate quas sapiente! Animi nihil nisi officia maiores possimus cumque!</p>
  <p>Nam, possimus? Cupiditate fugit corporis est, aliquam ex tempore eaque quae omnis doloribus reiciendis ullam aspernatur eligendi dignissimos, quos nobis!</p>
  <p>Mollitia at sequi debitis odio alias ducimus itaque voluptates libero reprehenderit asperiores, totam dicta quod autem illo a, similique quibusdam?</p>
  <p>Ea itaque illum, nobis sed voluptatibus ratione eveniet id dolor mollitia est blanditiis nisi aliquam quam doloremque et delectus culpa?</p>
  <p>Eligendi atque culpa maiores blanditiis ut. Sint minima sit, magnam blanditiis distinctio nemo dignissimos architecto, explicabo labore odio, voluptates optio.</p>
  <p>Quisquam, atque? Fugiat sapiente blanditiis repellendus omnis necessitatibus laborum maiores doloribus laboriosam quidem voluptatibus tenetur, quisquam magnam. Optio, alias porro?</p>
  <p>Distinctio expedita facere officia cumque sit, quis, dolore illum tenetur deleniti blanditiis, quo harum nostrum quaerat deserunt. Laborum, nulla asperiores?</p>
  <p>Dolore placeat, est odit sunt rerum architecto, vel, voluptatum itaque reprehenderit nam dolores necessitatibus corrupti quae minima beatae hic iste!</p>
  <p>Autem distinctio architecto ipsam est reprehenderit dolore quam omnis repudiandae, natus alias ea quis unde accusantium nemo illum, quaerat mollitia?</p>
</div>
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CSS

            
              html {
  box-sizing: border-box;
}

*,*::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}

.container {
  width: 100%;
  margin: 0 auto;
  padding: 20px;
  max-width: 800px;
}

img {
  max-width: 100%;
  margin-bottom: 20px;
}

p {
  margin-bottom: 20px;
}
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JS
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