css/css-variables/variable-reference-14.html

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<!DOCTYPE html>
<title>CSS Test: Test that important variable declarations cascade correctly.</title>
<link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
<link rel="help" href="http://www.w3.org/TR/css-variables-1/#defining-variables">
<link rel="match" href="support/color-green-ref.html">
<style>
#a {
  --a: green !important;
}
p {
  color: red;
  --a: crimson;
  color: var(--a);
}
</style>
<p id=a>This text must be green.</p>