cross-shadow-boundary-slot-3-ref.html

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<!doctype html>

<span id="outer">Outer</span>

<div>

  <span>Inner</span>

  <div>

    <span id="slotted">Slotted</span>

    <span id="nested">Nested</span>

  </div>

</div>

<script>

  const start = outer.firstChild;

  const end = document.getElementById("slotted").firstChild;

  window.getSelection()

      .setBaseAndExtent(start, 3, end, 4);

</script>