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chromium/third_party/blink/web_tests/external/wpt/css/selectors/invalidation/empty-pseudo-in-has.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>CSS Selectors Invalidation: :empty in :has() argument</title>
<link rel="author" title="Byungwoo Lee" href="[email protected]">
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #subject { color: red }
  #subject:has(:empty) { color: green }
  #subject:has(:not(:empty)) { color: blue }
</style>
<div id="subject"></div>
<script>
const red = 'rgb(255, 0, 0)';
const green = 'rgb(0, 128, 0)';
const blue = 'rgb(0, 0, 255)';

function testColor(test_name, color) {
  test(function() {
      assert_equals(getComputedStyle(subject).color, color);
  }, test_name);
}

testColor("Empty #subject", red);

let child = document.createElement("div");
child.id = "child";
subject.appendChild(child);

testColor("Insert div#child to #subject", green);

child.appendChild(document.createElement("div"));

testColor("Insert div to div.#child", blue);

child.replaceChildren();
testColor("Remove div from div.#child", green);

child.textContent = "Test";
testColor("Insert text into div.#child", blue);

child.textContent = "";
testColor("Remove text from div.#child", green);
</script>