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chromium/third_party/blink/web_tests/external/wpt/css/css-variables/wide-keyword-fallback-002.html 

<!doctype html>
<title>CSS Test: Wide keyword can be used as a fallback variable value for custom properties themselves</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-variables/#substitute-a-var">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1544886">
<link rel="match" href="wide-keyword-fallback-002-ref.html">
<style>
  .outer1 {
    --color: green;
  }
  .outer2 {
    --color: var(--foo, unset);
  }
  .inner {
    color: var(--color);
  }
</style>
<div class="outer1">
  <div class="outer2">
    <div class="inner">
      Should be green
    </div>
  </div>
</div>