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chromium/third_party/blink/web_tests/external/wpt/css/css-text-decor/text-shadow/basic-opacity-zero.html 

<!doctype html>
<title>Text with decoration and a text-shadow with a color with alpha=0</title>
<link rel="help" href="https://drafts.csswg.org/css-text-decor/#text-shadow-property">
<link rel="help" href="https://drafts.csswg.org/css-text-decor/#text-decoration-property">
<link rel="match" href="basic-opacity-zero-ref.html">
<style>
  #target {
    font-size: 100px;
    color: rgba(0 255 0 / 0.5);
    text-shadow: 0 2px 0 rgba(255 128 0 / 0);
    text-decoration: line-through;
  }
</style>
<div id="target">X</div>