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Test Info:

<!doctype html>
<title>CSS Container Queries Test: counters depending on container queries</title>
<link rel="match" href="counters-ref.html">
<style>
#container {
container-type: size;
width: 200px;
height: 200px;
}
#counter::before {
content: counter(my-counter);
}
@container (min-width: 200px) {
#counter {
counter-reset: my-counter 100;
}
}
</style>
<p>Pass if you see the number 100 below.</p>
<div id="container">
<div id="counter"></div>
</div>