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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/transform-style below:

transform-style - CSS | MDN

transform-style: preserve-3d;

<section class="default-example" id="default-example">
  <div class="transition-all layer" id="example-element">
    <p>Parent</p>
    <div class="numeral"><code>rotate3d(1, 1, 1, 45deg)</code></div>
  </div>
</section>

.layer {
  background: #623e3f;
  border-radius: 0.75rem;
  color: white;
  transform: perspective(200px) rotateY(30deg);
}

.numeral {
  background-color: #ffba08;
  border-radius: 0.2rem;
  color: black;
  margin: 1rem;
  padding: 0.2rem;
  transform: rotate3d(1, 1, 1, 45deg);
}

If flattened, the element's children will not exist on their own in the 3D-space.

As this property is not inherited, it must be set for all non-leaf descendants of the element.

Syntax

/* Keyword values */
transform-style: flat;
transform-style: preserve-3d;

/* Global values */
transform-style: inherit;
transform-style: initial;
transform-style: revert;
transform-style: revert-layer;
transform-style: unset;

Values

flat: Indicates that the children of the element are lying in the plane of the element itself.
preserve-3d: Indicates that the children of the element should be positioned in the 3D-space.

Description

The spec lists some grouping property values, which require the user agent to create a flattened representation of the descendant elements before they can be applied, and therefore force the element to have a used value of transform-style: flat, even when preserve-3d is specified. These property values include:

overflow: any value other than visible or clip.
opacity: any value less than 1.
filter: any value other than none.
clip: any value other than auto.
clip-path: any value other than none.
isolation: used value of isolate.
mask-image: any value other than none.
mask-border-source: any value other than none.
mix-blend-mode: any value other than normal.
contain: paint and any other property/value combination that causes paint containment. This includes any property that affect the used value of the contain property, such as content-visibility: hidden.

Formal definition Formal syntax

transform-style = 
  flat         |
  preserve-3d

Examples Transform style demonstration

In this example we have a 3D cube created using transforms. The parent container of the cube faces has transform-style: preserve-3d set on it by default, so it is transformed in the 3D space and you can see it as intended.

We also provide a checkbox allowing you to toggle between this, and transform-style: flat. In this alternative state, the cube faces are all flattened onto the plane of their parent, and you might not be able to see them at all, depending on the browser you are using.

HTML

<section id="example-element">
  <div class="face front">1</div>
  <div class="face back">2</div>
  <div class="face right">3</div>
  <div class="face left">4</div>
  <div class="face top">5</div>
  <div class="face bottom">6</div>
</section>

<div class="checkbox">
  <label for="preserve"><code>preserve-3d</code></label>
  <input type="checkbox" id="preserve" checked />
</div>

CSS

#example-element {
  margin: 50px;
  width: 100px;
  height: 100px;
  transform-style: preserve-3d;
  transform: rotate3d(1, 1, 1, 30deg);
}

.face {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  position: absolute;
  backface-visibility: inherit;
  font-size: 60px;
  color: white;
}

.front {
  background: rgb(90 90 90 / 70%);
  transform: translateZ(50px);
}

.back {
  background: rgb(0 210 0 / 70%);
  transform: rotateY(180deg) translateZ(50px);
}

.right {
  background: rgb(210 0 0 / 70%);
  transform: rotateY(90deg) translateZ(50px);
}

.left {
  background: rgb(0 0 210 / 70%);
  transform: rotateY(-90deg) translateZ(50px);
}

.top {
  background: rgb(210 210 0 / 70%);
  transform: rotateX(90deg) translateZ(50px);
}

.bottom {
  background: rgb(210 0 210 / 70%);
  transform: rotateX(-90deg) translateZ(50px);
}

JavaScript

const cube = document.getElementById("example-element");
const checkbox = document.getElementById("preserve");

checkbox.addEventListener("change", () => {
  cube.style.transformStyle = checkbox.checked ? "preserve-3d" : "flat";
});

Result Specifications Browser compatibility

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