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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-clip/clip-text-flex.html 

<!DOCTYPE html>
<title>background-clip:text with display:flex</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-4/#valdef-background-clip-text">
<link rel="match" href="clip-text-flex-ref.html">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
.clip {
  font-size: 80px;
  color: transparent;
  background-color: green;
  background-clip: text;
}
.flex {
    display: flex;
}
.inline-flex {
    display: inline-flex;
}
</style>
<div class="clip flex">flex</div>
<div class="clip inline-flex">inline-flex</div>