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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/absolute-fixed-in-legend.html 

<!DOCTYPE html>
<title>Absolute/fixed-positioned boxes in LEGEND should be painted on the fieldset content</title>
<link rel=match href=absolute-fixed-in-legend-ref.html>
<style>
.absolute-container {
  position: relative;
  border: none;
  padding: 0;
  margin: 0;
}

.absolute-container .legend-content {
  display: block;
  font-size: 32px;
  position: absolute;
  left: 0px;
  background: lime;
  width: 10em;
}

.fixed-container {
  contain: paint;
  border: none;
  padding: 0;
  margin: 0;
}

.fixed-container .legend-content {
  display: block;
  font-size: 32px;
  position: fixed;
  left: 0px;
  background: lime;
  width: 10em;
}

.fieldset-content {
  background: red;
  font-size: 32px;
  width: 10em;
}
</style>

<fieldset class="absolute-container">
  <legend><span class="legend-content">legend</span></legend>
  <div class="fieldset-content">content</div>
</fieldset>

<fieldset class="fixed-container">
  <legend><span class="legend-content">legend</span></legend>
  <div class="fieldset-content">content</div>
</fieldset>