has-slotted-query-selector.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scoping/has-slotted-query-selector.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8" />

<title>:has-slotted and query-selector</title>

<link rel="help" href="https://github.com/w3c/csswg-drafts/pull/10586" />

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="ancestor"><template shadowrootmode="open"><div id="host"><template shadowrootmode="open"><style>

  slot {

    color: rgb(0, 0, 0);

  :has-slotted {

    color: rgb(0, 255, 0);

</style><slot></slot></template><slot></slot></div></template></div>

<script>

  const host = ancestor.shadowRoot.querySelector('#host');

  for(const container of [host, ancestor]) {

    host.replaceChildren(document.createElement('slot'));

    ancestor.replaceChildren();

    const slot = host.shadowRoot.querySelector("slot");

    test(function () {

      assert_equals(slot.assignedNodes({flatten: true}).length, 0, "slot should have 0 nodes");

      assert_false(slot.matches(":has-slotted"), "slot element should not match :has-slotted");

      assert_equals(getComputedStyle(slot).color, "rgb(0, 0, 0)", "slot element should not match :has-slotted");

      assert_equals(host.shadowRoot.querySelectorAll(":has-slotted").length, 0, "slot element should not match :has-slotted");

    }, ":has-slotted does not match or querySelector when there are no assigned nodes" + (container == ancestor ? " (flattened)" : ""));

    test(function () {

      container.append(document.createElement("div"));

      assert_equals(slot.assignedNodes({flatten: true}).length, 1, "slot should have 1 node");

      assert_true(slot.matches(":has-slotted"), "slot element should match :has-slotted with 1 child node");

      assert_equals(getComputedStyle(slot).color, "rgb(0, 255, 0)", "slot element should match :has-slotted with 1 child node");

      assert_equals(host.shadowRoot.querySelectorAll(":has-slotted").length, 1, "slot element should match :has-slotted with 1 child node");

    }, ":has-slotted must match/querySelector when an element is assigned" + (container == ancestor ? " (flattened)" : ""));

    test(function () {

      container.replaceChildren();

      assert_equals(slot.assignedNodes({flatten: true}).length, 0, "slot should have 0 nodes");

      assert_false(slot.matches(":has-slotted"), "slot element should not match :has-slotted after empty");

      assert_equals(getComputedStyle(slot).color, "rgb(0, 0, 0)", "slot element should not match :has-slotted after empty");

      assert_equals(host.shadowRoot.querySelectorAll(":has-slotted").length, 0, "slot element should not match :has-slotted after empty");

    }, ":has-slotted does not when child nodes are replaced" + (container == ancestor ? " (flattened)" : ""));

    test(function () {

      container.append(document.createTextNode(""));

      assert_equals(slot.assignedNodes({flatten: true}).length, 1, "slot should have 1 node");

      assert_true(slot.matches(":has-slotted"), "slot element should match :has-slotted with 1 text node");

      assert_equals(getComputedStyle(slot).color, "rgb(0, 255, 0)", "slot element should match :has-slotted with 1 text node");

      assert_equals(host.shadowRoot.querySelectorAll(":has-slotted").length, 1, "slot element should match :has-slotted with 1 text node");

    }, ":has-slotted must match/querySelector when a text node is assigned" + (container == ancestor ? " (flattened)" : ""));

</script>