File: ParentNode-querySelector-scope.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>querySelector(All) scoped to a root element</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div><h1 id="test"></h1><p><span>hello</span></p></div>

<script>
"use strict";
const div = document.querySelector("div");
const p = document.querySelector("p");

test(() => {
  assert_equals(div.querySelector(":scope > p"), p);
  assert_equals(div.querySelector(":scope > span"), null);
}, "querySelector with :scope");

test(() => {
  assert_equals(div.querySelector("#test + p"), p);
  assert_equals(p.querySelector("#test + p"), null);
}, "querySelector with id and sibling");

test(() => {
  assert_array_equals(div.querySelectorAll(":scope > p"), [p]);
  assert_array_equals(div.querySelectorAll(":scope > span"), []);
}, "querySelectorAll with :scope");

test(() => {
  assert_array_equals(div.querySelectorAll("#test + p"), [p]);
  assert_array_equals(p.querySelectorAll("#test + p"), []);
}, "querySelectorAll with id and sibling");
</script>