File: container-units-selection-pseudo.html

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<!DOCTYPE html>
<title>Container-relative units in ::selection</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-lengths">
<link rel="match" href="container-units-selection-pseudo-ref.html">
<style>
  #outer, #inner {
    container-type: size;
  }
  #outer {
    width: 200px;
    height: 200px;
    border: 1px solid black;
  }
  #inner {
    width: 100px;
    height: 100px;
    background-color: skyblue;
  }
  #inner::selection {
    background-color: seagreen;
    text-decoration: underline solid;
    text-underline-offset: 10cqh;
  }
</style>
<div id=outer>
  <div id=inner>
    Some text
  </div>
</div>

<script>
  let range = document.createRange();
  range.selectNode(inner);
  window.getSelection().addRange(range);
</script>