wpt/css/selectors/invalidation/empty-pseudo-in-has-display-none.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selectors Invalidation: :empty in :has() with display:none</title>
<link rel="author" title="Simon Fraser" href="smfr@apple.com">
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
<link rel="help" href="https://drafts.csswg.org/selectors/#empty-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #subject {
    color: green;
  }
  #subject:has(:empty) {
    display: none;
  }
</style>
<div id="subject">
  <p>This should be visible after the child div gets content.</p>
  <div id="child"></div>
</div>
<script>
const subject = document.getElementById("subject");
const child = document.getElementById("child");

function testVisibility(test_name, expectVisible) {
  test(function() {
    const rect = subject.getBoundingClientRect();
    if (expectVisible) {
      assert_not_equals(getComputedStyle(subject).display, "none", "display should not be none");
      assert_greater_than(rect.width, 0, "width should be greater than 0");
      assert_greater_than(rect.height, 0, "height should be greater than 0");
    } else {
      assert_equals(getComputedStyle(subject).display, "none", "display should be none");
    }
  }, test_name);
}

testVisibility("Initially hidden because #child is :empty", false);

child.textContent = "text";
testVisibility("Visible after inserting text into #child", true);

{
  let inner = document.createElement("div");
  child.appendChild(inner);
}
testVisibility("Hidden after inserting empty element into #child", false);

child.textContent = "text";
testVisibility("Visible after inserting text into empty #child", true);

child.replaceChildren();
testVisibility("Hidden again after removing all children from #child", false);

child.textContent = "text";
testVisibility("Visible again after inserting text into empty #child", true);

child.textContent = "";
testVisibility("Hidden again after clearing text from #child", false);

{
  let inner = document.createElement("div");
  inner.textContent = "content";
  child.appendChild(inner);
}
testVisibility("Visible after inserting non-empty element into #child", true);
</script>

<!-- Test :has(:not(:empty)) with display:none -->
<style>
  #subject2 {
    display: none;
  }
  #subject2:has(:not(:empty)) {
    display: block;
  }
</style>
<div id="subject2">
  <div id="child2"></div>
</div>
<script>
{
  const subject2 = document.getElementById("subject2");
  const child2 = document.getElementById("child2");

  function testVisibility2(test_name, expectVisible) {
    test(function() {
      if (expectVisible) {
        assert_not_equals(getComputedStyle(subject2).display, "none", "display should not be none");
      } else {
        assert_equals(getComputedStyle(subject2).display, "none", "display should be none");
      }
    }, test_name);
  }

  testVisibility2(":not(:empty) - Initially hidden because #child2 is :empty", false);

  child2.textContent = "text";
  testVisibility2(":not(:empty) - Visible after inserting text into #child2", true);

  child2.textContent = "";
  testVisibility2(":not(:empty) - Hidden after clearing text from #child2", false);

  child2.textContent = "text";
  testVisibility2(":not(:empty) - Visible again after inserting text into #child2", true);

  child2.replaceChildren();
  testVisibility2(":not(:empty) - Hidden after removing all children from #child2", false);

  child2.appendChild(document.createElement("div"));
  testVisibility2(":not(:empty) - Visible after inserting element into #child2", true);
}
</script>