g/TR/css-values-4/#calc-computed-value
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  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-values-4/#calc-computed-value">

  <meta name="flags" content="">
  <meta content="This test verifies that terms with a percentage unit that can not be resolved at computed-value time will require a calc() wrapper. A term with an em value, on the other hand, must be resolved at computed-value time and th