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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/border-image-calc.html 

<!doctype html>
<title>CSS Test: border-image honors calc() lengths / percentages</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://bugzil.la/1517521">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#border-image-width">
<link rel="match" href="border-image-calc-ref.html">
<style>
  #test {
    background-color: red;
    border: 100px solid red;
    border-image-slice: 10;
    border-image-source: url("support/green_color.png");
    border-image-width: 100px calc(100px) calc(100%) calc(50% + 50px);
    height: 0;
    width: 0;
  }
</style>
<p>Test passes if there is a green 200px times 200px square.</p>
<div id="test"></div>