css/cssom/mediaquery-sort-dedup.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSSOM test: Media query serialization quirks</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#serializing-media-queries">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
  assert_equals(matchMedia("(min-width: 10px) and (min-height: 10px)").media, "(min-width: 10px) and (min-height: 10px)");
} , "Media queries are not sorted lexicographically");
test(function() {
  assert_equals(matchMedia("(color) and (color)").media, "(color) and (color)");
}, "Media queries are not deduplicated");
</script>