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chromium/third_party/blink/web_tests/wpt_internal/html/semantics/forms/the-meter-element/meter-appearance-none-suboptimum-value-custom-color-rendering.html 

<!doctype html>
<title>meter appearance none rendering</title>
<link rel="match" href="reference/meter-appearance-none-suboptimum-value-custom-color-rendering-ref.html">
<style>
  #target {
    appearance: none;
  }

  #target::-webkit-meter-suboptimum-value {
    background: coral;
  }
</style>
<meter value="0.9" high="0.7" id="target"></meter>