File: pseudo-elements-012.html

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<!DOCTYPE html>
<html class="reftest-wait">
<title>CSS Container Queries Test: ::highlight pseudo size container change</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
<link rel="match" href="pseudo-elements-010-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
  #container {
    width: 300px;
    container-type: inline-size;
  }
  #container::highlight(hi) {
    color: red;
    background: transparent;
  }
  @container (width >= 400px) {
    #container::highlight(hi) {
      color: green;
      background: transparent;
    }
  }
</style>
<div id="container">Highlight</div>
<script>
  let highlight_range = document.createRange();
  highlight_range.selectNode(container);
  CSS.highlights.set("hi", new Highlight(highlight_range));

  requestAnimationFrame(() => {
    requestAnimationFrame(() => {
      container.style.width = "500px";
      takeScreenshot();
    });
  });
</script>