css/css-conditional/container-queries/query-evaluation.html

<!doctype html>
<title>Evaluation of queries</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #container {
    width: 1px;
    height: 0px;
    container-type: size;
    --applied:false;
  }
</style>
<div id=container>
  <div id=inner></div>
</div>
<script>
  setup(() => assert_implements_size_container_queries());

  function test_query(query, expected) {
    test((t) => {
      let style = document.createElement('style');
      t.add_cleanup(() => { style.remove(); });
      style.innerText = `@container ${query} { #inner { --applied:true; } }`;
      let cs = getComputedStyle(inner);
      assert_equals(cs.getPropertyValue('--applied'), 'false');
      document.head.append(style);
      assert_equals(cs.getPropertyValue('--applied'), expected.toString());
    }, query);
  };

  // We don't care about specific features in this file, only higher level
  // evaluation like "and", "or", and so forth. The features "width", "height"
  // and "unknown" are arbitrarily chosen to represent true, false, and
  // unknown values, respectively.

  test_query('(width)', true);
  test_query('(height)', false);
  test_query('(unknown)', false);
  test_query('unknown(width)', false);

  // Nesting in <container-query>:
  test_query('((width))', true);
  test_query('((height))', false);
  test_query('((unknown))', false);
  test_query('((((width))))', true);
  test_query('((((height))))', false);
  test_query('((((unknown))))', false);

  // "not" in <container-query>:
  test_query('(not (width))', false);
  test_query('(not (height))', true);
  test_query('(not (unknown))', false);
  test_query('(not unknown(width))', false);

  // "and" in <container-query>:
  test_query('((width) and (width))', true);
  test_query('((width) and (width) and (width))', true);
  test_query('((height) and (height))', false);
  test_query('((height) and (width) and (width))', false);
  test_query('((width) and (height) and (width))', false);
  test_query('((width) and (width) and (height))', false);
  test_query('((unknown) and (width) and (width))', false);
  test_query('((width) and (unknown) and (width))', false);
  test_query('((width) and (width) and (unknown))', false);

  // "or" in <container-query>:
  test_query('((width) or (width))', true);
  test_query('((width) or (width) or (width))', true);
  test_query('((height) or (height))', false);
  test_query('((height) or (width) or (width))', true);
  test_query('((width) or (height) or (width))', true);
  test_query('((width) or (width) or (height))', true);
  test_query('((unknown) or (width) or (width))', false);
  test_query('((width) or (unknown) or (width))', false);
  test_query('((width) or (width) or (unknown))', false);
  test_query('((unknown) or (height) or (width))', false);

  // Combinations, <container-query>:
  test_query('(not ((width) and (width)))', false);
  test_query('(not ((width) and (height)))', true);
  test_query('((width) and (not ((height) or (width))))', false);
  test_query('((height) or (not ((height) and (width))))', true);
  test_query('((height) or ((height) and (width)))', false);

</script>