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chromium/third_party/blink/web_tests/external/wpt/html/rendering/replaced-elements/the-select-element/select-1-block-size-001-ref-2.html 

<!doctype html>
<title>CSS Test Reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1571764">
<style>
div {
  -webkit-appearance: none;
  appearance: none;

  background: black;
  color: transparent;

  line-height: 100px;
  width: 100px;

  border: 0;
  padding: 0;

  display: inline-block;
}
</style>
<div>A</div>
<div>A</div>