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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>

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Insecure Resource

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CSS

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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

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

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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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HTML 

              
                <div class="layout">

  <div class="layout__item" style="--featured-2: true; width: 670px;">
    <article class="post">
      <div class="test">
        <div class="category">Government & Policy</div>
        <h3 class="title">Worldcoin hopes to resume iris scans in Kenya</h3>
        <div class="meta">
          <p>Ahmad Shadeed</p>
          <time class="river-byline__full-date-time" datetime="2023-08-03T14:20:14">5:20 PM GMT+3<span class="full-date-time__separator">•</span>August 3, 2023</time>
        </div>
      </div>

      <div class="desc">
        Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
      </div>

      <figure class="media">
        <img alt="" src="https://techcrunch.com/wp-content/uploads/2023/03/reddit.jpg?w=850&h=492&crop=1">
      </figure>
    </article>
  </div>

  <div class="layout__item" style="--type: plain; width: 400px;">
    <article class="post">
      <div class="test">
        <div class="category">Government & Policy</div>
        <h3 class="title">Worldcoin hopes to resume iris scans in Kenya</h3>
        <div class="meta">
          <p>Ahmad Shadeed</p>
          <time class="river-byline__full-date-time" datetime="2023-08-03T14:20:14">5:20 PM GMT+3<span class="full-date-time__separator">•</span>August 3, 2023</time>
        </div>
      </div>

      <div class="desc">
        Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
      </div>

      <figure class="media">
        <img alt="" src="https://techcrunch.com/wp-content/uploads/2023/03/reddit.jpg?w=850&h=492&crop=1">
      </figure>
    </article>
  </div>

  <div class="layout__item" style="--thumb: true;">
    <article class="post">
      <div class="test">
        <div class="category">Government & Policy</div>
        <h3 class="title">Worldcoin hopes to resume iris scans in Kenya</h3>
        <div class="meta">
          <p>Ahmad Shadeed</p>
          <time class="river-byline__full-date-time" datetime="2023-08-03T14:20:14">5:20 PM GMT+3<span class="full-date-time__separator">•</span>August 3, 2023</time>
        </div>
      </div>

      <div class="desc">
        Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
      </div>

      <figure class="media">
        <img alt="" src="https://techcrunch.com/wp-content/uploads/2023/03/reddit.jpg?w=850&h=492&crop=1">
      </figure>
    </article>
  </div>

  <div class="layout__item" style="--flipped: true;">
    <article class="post">
      <div class="test">
        <div class="category">Government &amp; Policy</div>
        <h3 class="title">Worldcoin hopes to resume iris scans in Kenya</h3>
        <div class="desc desc-test">
          Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
        </div>
        <div class="meta">
          <p>Ahmad Shadeed</p>
          <time class="river-byline__full-date-time" datetime="2023-08-03T14:20:14">5:20 PM GMT+3<span class="full-date-time__separator">•</span>August 3, 2023</time>
        </div>
      </div>

      <div class="desc">
        Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
      </div>

      <figure class="media">
        <img alt="" src="https://techcrunch.com/wp-content/uploads/2023/03/reddit.jpg?w=850&amp;h=492&amp;crop=1">
      </figure>
    </article>
  </div>

  <div class="layout__item">
    <article class="post">
      <div class="test">
        <div class="category">Government &amp; Policy</div>
        <h3 class="title">Worldcoin hopes to resume iris scans in Kenya</h3>
        <div class="meta">
          <p>Ahmad Shadeed</p>
          <time class="river-byline__full-date-time" datetime="2023-08-03T14:20:14">5:20 PM GMT+3<span class="full-date-time__separator">•</span>August 3, 2023</time>
        </div>
      </div>

      <div class="desc">
        Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
      </div>
    </article>
  </div>

  <div class="layout__item" style="--featured-1: true;">
    <article class="post">
      <div class="test">
        <h3 class="title">Worldcoin hopes to resume iris scans in Kenya</h3>
        <div class="desc desc-test">
          Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
        </div>
        <div class="meta">
          <p>Ahmad Shadeed</p>
          <time class="river-byline__full-date-time" datetime="2023-08-03T14:20:14">5:20 PM GMT+3<span class="full-date-time__separator">•</span>August 3, 2023</time>
        </div>
      </div>

      <div class="desc">
        Sam Altman’s crypto startup Worldcoin yesterday faced its first major hurdle in Africa when authorities in Kenya suspended
      </div>

      <figure class="media">
        <img alt="" src="https://techcrunch.com/wp-content/uploads/2023/03/reddit.jpg?w=850&amp;h=492&amp;crop=1">
      </figure>
    </article>
  </div>

</div>
!

CSS 

              
                .layout {
  --cols: 1fr;
  display: grid;
  grid-template-columns: var(--cols);
  align-items: start;
  gap: 4rem;
  max-width: 1200px;
  margin: 1rem auto;
}

.layout__item {
  container-name: test;
  container-type: inline-size;
  resize: horizontal;
  overflow: hidden;
  width: 100%;
  max-width: 90vw;
  background-color: #f4f4f4;
  padding: 1rem;
  border-radius: 12px;
}

.feature-island {
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: max(1rem, 1rem + 2cqw);

  @container test (min-width: 600px) {
    grid-template-columns: 2fr 1.25fr;
  }
}

/* Post */
.post {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1rem;

  @container (min-width: 450px) {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.title {
  font-weight: 800;
  font-size: max(1rem, 2.5cqw);
  line-height: 1;
  grid-column: 1/2;

  @container style(--thumb: true) {
    font-size: max(1.25rem, 3cqw);
  }
}

.meta {
  grid-column: 1/2;

  p:first-child {
    font-weight: 500;
    font-size: 14px;
  }
}

.desc {
  color: #777;

  @container style(--thumb: true) {
    grid-column: 2/3;
    grid-row: 1/-1;

    display: none;
    font-size: clamp(14px, 1.5cqw, 20px);

    @container (min-width: 450px) {
      display: block;
    }
  }
}

.media {
  position: relative;
  height: fit-content;

  &:after {
    content: "";
    position: absolute;
    inset: 0;
    background: lightgrey;
  }
  @container (min-width: 450px) {
    grid-row: 1/-1;
    grid-column: 3/4;
  }
}

.category {
  color: #00d301;
  font-size: 14px;
}

/********** Plain **********/
.test {
  display: flex;
  flex-direction: column;
  gap: max(2px, 0.5cqw);
}

@container style(--type: plain) {
  .post {
    display: block;
  }

  .desc,
  time {
    display: none;
  }

  .title {
    font-size: max(1rem, 3.5cqw);
  }

  .media {
    display: none;
  }
}

@container style(--featured-2: true) {
  .title {
    font-size: min(45px, 6cqw);
  }

  .desc {
    font-size: max(1rem, 3cqw);
  }

  .category,
  time {
    display: none;
  }

  .post {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    gap: 0.5rem;
  }

  .media,
  .desc {
    grid-area: initial;
  }

  .meta {
    order: 2;
  }

  .media {
    order: 4;
  }

  .test {
    display: contents;
  }
}

.post:not(:has(.media)) {
  grid-template-columns: 1fr;

  .desc {
    display: none;
  }

  @container (min-width: 450px) {
    grid-template-columns: 1fr 1fr 1fr;

    .desc {
      display: block;
      grid-column: 2/4;
    }
  }
}

.desc-test {
  display: none;
}

@container style(--flipped: true) {
  .post {
    grid-template-columns: minmax(min(120px, 10cqw), min(270px, 27cqw)) 1fr;
    row-gap: 0;
  }

  .test {
    grid-column: 2/3;
    grid-row: 1;
  }

  .desc {
    grid-row: 2;
    display: none;
  }

  .media {
    grid-column: 1;
  }

  .desc-test {
    display: block;
  }
}

@container style(--featured-1: true) {
  .post {
    display: flex;
    flex-direction: column;
    column-gap: 0.5rem;
  }

  .test {
    &:before {
      content: "Featured article";
      display: block;
      font-size: 1.5rem;
      font-weight: bold;
      background: linear-gradient(32deg, #00d301 0%, #36c275 50%, #00a562 100%);
      background-clip: text;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
  }

  .desc {
    display: none;
  }

  .desc-test {
    display: block;
  }

  @container (min-width: 600px) {
    .test {
      grid-column: 1/2;
      grid-row: 1;
    }

    .media {
      grid-column: 2/-1;
    }

    .post {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      column-gap: 2rem;
      row-gap: 0;
    }
  }
}

.other-content {
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* other styles */

body {
  font-family: system-ui;
  line-height: 1.45;
  padding: 1rem;
}

* {
  box-sizing: border-box;
}

img {
  max-width: 100%;
  display: block;
}
!

JS 

              
                // // Function to update the element with its width value
// function updateElementWidth(elementClass) {
//   const elements = document.getElementsByClassName(elementClass);
//   for (let i = 0; i < elements.length; i++) {
//     const element = elements[i];
//     element.innerHTML = `${elementClass} width: ${element.offsetWidth}px`;
//   }
// }

// // Function to handle window resize event
// function handleWindowResize() {
//   updateElementWidth("header");
//   updateElementWidth("content");
//   updateElementWidth("aside");
//   updateElementWidth("footer");
// }

// // Add event listener to handle window resize
// window.addEventListener("resize", handleWindowResize);

// // Initial call to update the element widths when the page loads
// handleWindowResize();
!
999px

Console