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<!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>
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