testing/web-platform/tests/css/css-animations/animation-pseudo-dynamic-001-ref.html


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<!doctype html>
<title>CSS test reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
.test {
  display: flex;
}
.test::before {
  content: "";
  display: block;
  width: 100px;
  height: 100px;
  background-color: green;
}
</style>
<div class="test"></div>