<div class="parent">
  <div class="loader" style="--count: 10">
    <span style="--index: 0">
    </span>
    <span style="--index: 1">
    </span>
    <span style="--index: 2">
    </span>
    <span style="--index: 3">
    </span>
    <span style="--index: 4">
    </span>
    <span style="--index: 5">
    </span>
    <span style="--index: 6">
    </span>
    <span style="--index: 7">
    </span>
    <span style="--index: 8">
    </span>
    <span style="--index: 9">
    </span>
  </div>
</div>