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chromium/third_party/blink/web_tests/external/wpt/css/css-images/image-set/image-set-calc-x-rendering-2.html 

<!DOCTYPE html>
<title>Image set calc x rendering</title>
<link rel="help" href="https://drafts.csswg.org/css-images-4/#image-set-notation">
<link rel="match" href="reference/image-set-rendering-ref.html">
<meta name="assert" content="image-set calc x rendering">
<style>
  #test {
    background-image: image-set(
      url("/images/green.png") calc(0.5x * 2),
      url("/images/red.png") 2x
    );
    width: 100px;
    height: 100px;
  }
</style>
<div id="test"></div>