css/css-cascade/important-vs-inline-003.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Cascade: inline style loses to !important</title>
  <link rel="help" href="https://crbug.com/1332956">
  <link rel="author" href="mailto:sesse@chromium.org">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <style>
    .cls {
      visibility: inherit !important;
    }
  </style>
</head>
<body>
  <div class="cls" id="el" style="visibility: hidden; height: 200px;"><iframe></iframe></div>
</body>
<script>
test(() => {
  el.setAttribute('disabled', 'disabled');
  el.offsetTop;
  el.style.height = '400px';
  assert_equals(getComputedStyle(el).visibility, "visible", "!important has higher priority than inline style");
});
</script>
</html>