This is the template project that's checked out and configured when you run the bando-up command from ljsthw-bandolier. This is where the code really lives.
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bandolier-template/admin/bando/demos/AspectRatio.svelte

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<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>