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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-clip/clip-text-dynamic-2-ref.html 

<!doctype html>
<title>CSS Test Reference</title>
<style>
  .text {
    background-color: blue;
    color: transparent;
    font: 50px/1 monospace;
    background-clip: text;
    height: 200px;
  }
  .prev {
    height: 100px;
  }
  p {
    color: transparent;
  }
</style>
<div class="text">
  <div class="prev"></div>
  <div class="inner">
    <p>XxX</p>
  </div>
</div>