File: pseudo-elements-009.html

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<!DOCTYPE html>
<title>CSS Container Queries Test: Container for highlight pseudo elements</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
<link rel="match" href="pseudo-elements-009-ref.html">
<style>
  #container {
    container-type: inline-size;
    width: 500px;
  }

  ::selection { color: red; background: transparent; }
  ::highlight(hi) { color: red; background: transparent; }

  @container (width >= 400px) {
    ::selection { color: green }
    ::highlight(hi) { color: green }
  }
</style>
<div id="container">
  <span id="sel">Selection</span>
  <span id="hi">Highlight</span>
</div>
<script>
  getSelection().selectAllChildren(sel);
  let highlight_range = document.createRange();
  highlight_range.selectNode(hi);
  CSS.highlights.set("hi", new Highlight(highlight_range));
</script>