v>
  <!-- This should be fully visible and not affected by the backdrop filter. -->
  <div style="position: absolute; top: 0; left: 100px; width: 100px; height: 100px; background: green"></div>
  <div style="position: absolute; top: 0; left: 100px; width: 100px; height: 1000px; opacity: 0; backdrop-filter: blur(3px)"></div>
</div>

