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chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/painting/custom-highlight-painting-below-target-text-ref.html 

<!DOCTYPE html>
<meta charset="UTF-8">
<style>
  #highlight {
    background-color: yellow;
    color: limegreen;
  }
  #highlight-and-target-text {
    background-color: orange;
    color: limegreen;
  }
  #target-text {
    background-color: orange;
  }
</style>
<span id="highlight">Some </span><span id="highlight-and-target-text">te</span><span id="target-text">xt</span>