File: before-dynamic-display-none.html

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<!doctype html>
<title>CSS Test: ::before box removed when display set to 'none'.</title>
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#generated-content">
<link rel="match" href="../reference/pass_if_pass_below.html">
<style>
  #id::before {
    content: "FAIL";
    position: absolute;
    width: 100px;
    height: 100px;
    background-color: red;
  }
  #id.none::before {
    display: none;
  }
</style>
<p>Test passes if there is the word "PASS" below.</p>
<div id="id" class="open">PASS</div>
<script>
  id.offsetTop;
  id.className = "none";
</script>