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chromium/third_party/blink/web_tests/external/wpt/css/css-variables/wide-keyword-fallback-001.html 

<!doctype html>
<title>CSS Test: Wide keyword can be used as a fallback variable value</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-001-ref.html">
<style>
  /* Should see a 10px border of the initial color */
  #outer {
    color: transparent;
    border: 10px solid;
  }

  #inner {
    color: var(--unknown, initial);
    border-width: 10px;
    border-style: var(--unknown, inherit);
  }
</style>
<div id="outer"><div id="inner"></div></div>