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chromium/third_party/blink/web_tests/external/wpt/css/css-content/pseudo-element-inline-box.html 

<!doctype html>
<title>CSS Test: content: url() on pseudo-elements is under a non-replaced box.</title>
<link rel="match" href="pseudo-element-inline-box-ref.html">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Boris Zbarsky" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-content/#typedef-content-content-list">
<style>
  div::before {
    border: 10px solid blue;
    content: url(resources/rect.svg);
    display: inline;
  }
</style>
<p>Should see a green image with a blue border</p>
<div></div>