css/css-pseudo/target-text-dynamic-001.html

<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8" />
<title>CSS Pseudo-Elements Test: Dynamic change ::target-text background color</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-pseudo/#selectordef-target-text">
<meta name="assert" content="This test checks that it's possible to modify dinamically the background color of a targeted text through ::target-text pseudo-element.">
<link rel="match" href="target-text-dynamic-001-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
  ::target-text {
    background-color: cyan;
  }
</style>

<p>The test passes if the following word has a magenta background.</p>
<div>Example</div>

<script>
  location.href = "#:~:text=Example";
  requestAnimationFrame(() => requestAnimationFrame(() => {
    if (document.styleSheets[0].cssRules[0])
      document.styleSheets[0].cssRules[0].style.backgroundColor = "magenta";
    takeScreenshot();
  }));
</script>
</html>