Day 73: size container features

posted on January 4., 2023

It’s time to get me up to speed with modern CSS. There’s so much new in CSS that I know too little about. To change that I’ve started #100DaysOfMoreOrLessModernCSS. Why more or less modern CSS? Because some topics will be about cutting-edge features, while other stuff has been around for quite a while already, but I just have little to no experience with it.

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In my previous posts about size container features I’ve only used the min-width feature, but there’s actually more you can query.

container-type: inline-size establishes size containment only on the inline axis. There is no block-size option because it wasn’t possible for browsers to implement, but there is a size option, which establishes size containment on both dimensions of the container. According to Miriam Suzanne, you should be careful using this option because I may cause side effects, but it allows you to query more than just the width/inline-size.

orientation

You can query the orientation of the container. If the height is larger than the width, the orientation is portrait. If the width is larger than the height, it's landscape.

.container {
  border: 8px solid aqua;
  container-type: size;

width: 10rem;
  height: 15rem;
}

.container2 {
  width: 15rem;
  height: 10rem;
}

.child {
  aspect-ratio: 1;
  width: 5rem;
  border: 4px solid;
  color: red;
}

@container (orientation: portrait) {
  .child {
    background: currentColor;
  }
}

<div class="container">
  <div class="child"></div>
</div>

<div class="container container2">
  <div class="child"></div>
</div>

aspect-ratio

.container3 {
  width: 10rem;
  height: 10rem;
}

.container4 {
  width: 10rem;
  height: 5.625rem;
  box-sizing: content-box;
}

@container (aspect-ratio: 1 / 1) {
  .child {
    background: blue;
  }
}

@container (aspect-ratio: 16 / 9) {
  .child {
    background: green;
  }
}

height

You can also query the height.

@container (min-height: 14rem) {
  .child {
    background: fuchsia;
  }
}

logical properties

Instead of width you can also use inline-size in your queries and instead of height you can use block-size.

@container (min-block-size: 14rem) {
  .sample4 .child {
    background: aqua;
  }
}

See on CodePen.

Want more?

1. Previous post: Day 72: the masonry-auto-flow property

Overview: 100 Days Of More Or Less Modern CSS

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