<style>
  aspect-test {
    display: flex;
    flex-direction: column;
  }

  .top-box p {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--value5);
    font-size: 2.5vw;
    padding: 1rem;
  }
</style>

<aspect-test>
  <div class="top-box" style="--aspect-ratio: 16/9;">
    <p>Every single visual experience that has a bounding plane has to deal with aspect ratios, whether that's a photo through a 1:1 ratio medium format camera or a 16:9 ratio 4k movie.  If there's a visual bounding box around the scene then everything in the scene must deal with the ratio of the width to the height.</p>
  </div>

  <div style="--aspect-ratio: 10/2; background-color: var(--value7); font-size: 1.5vw;">
    <p>CSS is one of the only visual systems that has no concept of aspect ratios despite the performance benefits of knowing the aspect of a block before the contents of the block are available.  If you know the aspect ratio of a block, and you know the width of the page, then you can render the block immediately because you only need <b>one</b> dimension to render both.</p>
  </div>

</aspect-test>
