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<!DOCTYPE html>
<style>
body {
background-color: aqua;
--target-width: 32px;
--target-height: 24px;
--scale: 1;
margin: calc(18px * var(--scale));
}
#target {
width: calc(var(--target-width) * var(--scale));
height: calc(var(--target-height) * var(--scale));
background-color: hotpink;
}
</style>
<div id="target"></div>
<script>
let params = new URLSearchParams(location.search);
if (params.has("scale")) {
document.body.style.setProperty("--scale", parseFloat(params.get("scale")));
}
</script>