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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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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

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Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="grid">
  <h1 style="--end-xl: 12; --end-l: 14">Grid Layout & custom properties</h1>
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Nemo, est? Nobis cupiditate ab amet delectus praesentium fuga excepturi expedita cumque corrupti, ipsam dolorum non. Eligendi eum repellendus ipsam veritatis alias.</p>
  <p style="--start:1; --end:5; --end-xl: 6"> Perspiciatis impedit unde nostrum iste libero soluta omnis hic accusantium</p>
  <p style="--start: 6; --end: 20; --start-xl: 8;">Corporis cum reprehenderit sint voluptatem animi ab ea, ad, nam esse nobis qui expedita molestias, porro dolores facilis quod quam necessitatibus minus ipsa. Laboriosam, corrupti. Sit, sed. Quos, exercitationem quae.</p>
  <p>Adipisci in obcaecati magni? Laboriosam quam voluptates esse est perferendis, asperiores consectetur numquam, quo ipsam iure incidunt odit vel officiis non? Dolor voluptatum ducimus earum sed rerum laborum pariatur obcaecati!</p>
  <p style="--end-xl: 10;">Ab vero rerum quae suscipit distinctio animi cumque consectetur exercitationem illum soluta saepe laborum corporis iure quia ullam maiores accusamus tempora eveniet rem, earum fuga repellat. Aspernatur similique quis voluptates?</p>
  <p  style="--start-xl: 11;">Natus veritatis assumenda velit dolore error facere est, esse, ducimus omnis, expedita inventore sint eos quam. Sunt cum libero et quas, dolor excepturi corrupti magni incidunt iste nulla minima sequi.</p>
  <p>Magni voluptatum impedit voluptate necessitatibus est eos non neque ipsum maxime nobis veniam, voluptas eveniet perferendis quasi voluptatibus doloremque, nisi molestiae exercitationem vel sed error in similique ad quas. Neque?</p>
  <p style="--start:1; --end: 6;">Quisquam, ratione eos! Provident dolor totam, possimus numquam, corporis consequuntur voluptatum voluptates aut quo officia suscipit deleniti, itaque minima minus voluptatem perspiciatis cupiditate modi dignissimos at praesentium! Aut, explicabo illo?</p>
  <p style="--start: 7; --end: 14;">Accusantium voluptatum deserunt voluptatem omnis consequatur aperiam inventore, vel, voluptatibus voluptate corrupti sapiente pariatur sunt, excepturi culpa. Pariatur, dolorem odit sapiente iusto molestias delectus impedit, fugit ea, quaerat reprehenderit eos!</p>
  <p style="--start: 15; --end: 20">Expedita atque dolorem blanditiis quisquam animi exercitationem nobis veritatis temporibus cumque eos, ea similique quaerat perspiciatis incidunt aliquam debitis veniam, dolores officiis. Alias excepturi at quisquam iusto, totam obcaecati ad.</p>
  <p style="--end-xl: 8;">Magnam sed culpa vitae dolores placeat quae aliquid soluta illum blanditiis architecto at iure aperiam ratione repellendus similique, ut sint labore expedita. Laboriosam, ipsum sapiente quae dignissimos eveniet saepe modi.</p>
  <p style="--start-xl: 9;">Lorem ipsum dolor sit amet consectetur adipiscing elit accumsan hendrerit, habitasse donec sapien tristique sem fringilla lacinia suscipit cursus, leo placerat vivamus aliquet vestibulum dui ultrices vehicula. Natoque sem facilisis nullam bibendum dictum parturient suscipit augue habitant, fermentum rutrum ridiculus rhoncus non himenaeos tortor aliquam euismod arcu, aenean eget lectus sodales pretium posuere condimentum mus. Aliquet suspendisse turpis tristique fermentum habitasse felis ultrices, conubia porta inceptos arcu eu vitae suscipit senectus, dictumst libero sapien imperdiet pulvinar accumsan.</p> 
  <p class="align-full">Align full</p>
  <p>Illum vero asperiores beatae, dignissimos similique animi voluptatibus praesentium debitis sit aliquid, vitae esse ratione quos voluptatum</p>
  <p>Sollicitudin ac natoque cursus feugiat urna quis sed mattis, eros per vehicula dictum tempor at diam velit magna, penatibus justo inceptos ligula orci aptent quisque. Risus ante erat per fames vivamus etiam cum, felis primis pharetra dapibus nulla aenean praesent, vehicula vel neque torquent parturient mauris. Ad urna sagittis fusce sapien nisl aptent eget hac leo, accumsan class hendrerit in montes quisque eu duis nostra, erat interdum cubilia maecenas phasellus turpis natoque sem.</p>
</div>
!

CSS 

              
                
.grid {
  grid-template-columns: 1fr [content-start] repeat(17, 1fr) [content-end] 1fr;
  display: grid;
  grid-row-gap: calc(1rem + 4vh);
  
  /* lineas del grid */
  --line-color: rgba(0,0,0,0.3);
}

.grid > * {
  /* inicio y fin por defecto */
  grid-column-start: var(--start, content-start);
  grid-column-end: var(--end, content-end);
  margin: 0;
}


/* responsive */
@media(min-width: 420px) {
  .grid > * {
    grid-column-start: var(--start-m, 
                       var(--start, content-start));
    grid-column-end:   var(--end-m, 
                       var(--end, content-end));
  }
}

@media(min-width: 768px) {
  .grid > * {
    grid-column-start: var(--start-l, 
                       var(--start-m, 
                       var(--start, content-start)));
    grid-column-end:   var(--end-l, 
                       var(--end-m, 
                       var(--end, content-end)));
  }
}
@media(min-width: 1200px) {
  .grid > * {
    grid-column-start: var(--start-xl,
                       var(--start-l, 
                       var(--start-m, 
                       var(--start, content-start))));
    grid-column-end:   var(--end-xl,
                       var(--end-l, 
                       var(--end-m, 
                       var(--end, content-end))));
  }
}


.align-full {
 /* problemas de especificidad 
  
  grid-column-start: 1;
  grid-column-end: -1;
*/
  --start: 1;
  --end: -1;
}




/* --------------------------------------------- */













.grid {
  width: 90%;
  margin:auto;
  padding: 12vh 0;
  max-width: 1200px;
  
  
  --cols:19;
  box-shadow:inset var(--line-color, transparent) .5px 0;
  background-image: 
    linear-gradient(to right, transparent calc(100% - 1px), var(--line-color, transparent) 100% );
  background-size: calc(100% / var(--cols))
}

.align-full {
  background-color: #333;
  color: #fff;
  padding: 1rem;
  text-align: center;
}


body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont,
    “Segoe UI”, “Roboto”, “Oxygen”, “Ubuntu”, “Cantarell”,
    “Fira Sans”, “Droid Sans”, “Helvetica Neue”,
    sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

h1 {
  font-size: 3rem;
  line-height: 1.2;
}
!

JS
!
999px

Console