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+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://open-ui.org/components/popover.research.explainer">
+<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
+<script src="resources/popover-utils.js"></script>
+
+<script>
+  function ensureShadowDom(host) {
+    host.querySelectorAll('my-element').forEach(host => {
+      if (host.shadowRoot)
+        return; // Declarative Shadow DOM is enabled
+      const template = host.firstElementChild;
+      assert_true(template instanceof HTMLTemplateElement);
+      const shadow = host.attachShadow({mode: 'open'});
+      shadow.appendChild(template.content);
+      template.remove();
+    })
+  }
+  function findPopovers(root) {
+    let popovers = [];
+    if (!root)
+      return popovers;
+    if (root instanceof Element && root.matches('[popover]'))
+      popovers.push(root);
+    popovers.push(...findPopovers(root.shadowRoot));
+    root.childNodes.forEach(child => {
+      popovers.push(...findPopovers(child));
+    })
+    return popovers;
+  }
+  function getPopoverReferences(testId) {
+    const testRoot = document.querySelector(`#${testId}`);
+    assert_true(!!testRoot);
+    ensureShadowDom(testRoot);
+    return findPopovers(testRoot);
+  }
+  function showTestPopover(testId,popoverNum) {
+    getPopoverReferences(testId)[popoverNum].showPopover();
+  }
+</script>
+
+<div id=test1>
+  <button onclick='showTestPopover("test1",0)'>Test1 Popover</button>
+  <my-element>
+    <template shadowrootmode=open>
+      <div popover>
+        <p>This should show, even though it is inside shadow DOM.</p>
+      </div>
+    </template>
+  </my-element>
+</div>
+
+<script>
+  test(function() {
+    const popover = getPopoverReferences('test1')[0];
+    popover.showPopover();
+    assert_true(popover.matches(':popover-open'));
+    assert_true(isElementVisible(popover));
+    popover.hidePopover(); // Cleanup
+  }, "Popovers located inside shadow DOM can still be shown");
+</script>
+
+
+<div id=test2>
+  <button id=t2b1 onclick='showTestPopover("test2",0)'>Test 2 Popover 1</button>
+  <div popover anchor=t2b1 style="top: 200px;">
+    <p>Popover 1</p>
+    <button id=t2b2 onclick='showTestPopover("test2",1)'>Test 2 Popover 2</button>
+  </div>
+  <my-element>
+    <template shadowrootmode=open>
+      <div popover anchor=t2b2 style="top: 400px;">
+        <p>Hiding this popover will hide *all* open popovers,</p>
+        <p>because t2b2 doesn't exist in this context.</p>
+      </div>
+    </template>
+  </my-element>
+</div>
+
+<script>
+  test(function() {
+    const [popover1,popover2] = getPopoverReferences('test2');
+    popover1.showPopover();
+    assert_true(popover1.matches(':popover-open'));
+    assert_true(isElementVisible(popover1));
+    popover2.showPopover();
+    assert_false(popover1.matches(':popover-open'), 'popover1 open'); // P1 was closed by P2
+    assert_false(isElementVisible(popover1), 'popover1 visible');
+    assert_true(popover2.matches(':popover-open'), 'popover2 open'); // P2 is open
+    assert_true(isElementVisible(popover2), 'popover2 visible');
+    popover2.hidePopover(); // Cleanup
+  }, "anchor references do not cross shadow boundaries");
+</script>
+
+
+<div id=test3>
+  <my-element>
+    <template shadowrootmode=open>
+      <button id=t3b1 onclick='showTestPopover("test3",0)'>Test 3 Popover 1</button>
+      <div popover anchor=t3b1>
+        <p>This popover will stay open when popover2 shows.</p>
+        <slot></slot>
+      </div>
+    </template>
+    <button id=t3b2 onclick='showTestPopover("test3",1)'>Test 3 Popover 2</button>
+  </my-element>
+  <div popover anchor=t3b2>Popover 2</div>
+</div>
+
+<script>
+  promise_test(async function() {
+    const [popover1,popover2] = getPopoverReferences('test3');
+    popover1.showPopover();
+    assert_true(popover1.matches(':popover-open'));
+    assert_true(isElementVisible(popover1));
+    // Showing popover2 should not close popover1, since it is a flat
+    // tree ancestor of popover2's anchor button.
+    popover2.showPopover();
+    assert_true(popover2.matches(':popover-open'));
+    assert_true(isElementVisible(popover2));
+    assert_true(popover1.matches(':popover-open'));
+    assert_true(isElementVisible(popover1));
+    popover1.hidePopover();
+    await waitForRender();
+    assert_false(popover1.matches(':popover-open'));
+    assert_false(isElementVisible(popover1));
+    assert_false(popover2.matches(':popover-open'));
+    assert_false(isElementVisible(popover2));
+  }, "anchor references use the flat tree not the DOM tree");
+</script>
+
+
+<div id=test4>
+  <button id=t4b1 onclick='showTestPopover("test4",0)'>Test 4 Popover 1</button>
+  <div popover anchor=t4b1>
+    <p>This should not get hidden when popover2 opens.</p>
+    <my-element>
+      <template shadowrootmode=open>
+        <button id=t4b2 onclick='showTestPopover("test4",1)'>Test 4 Popover 2</button>
+        <div popover anchor=t4b2>
+          <p>This should not hide popover1.</p>
+        </div>
+      </template>
+    </my-element>
+  </div>
+</div>
+
+<script>
+  promise_test(async function() {
+    const [popover1,popover2] = getPopoverReferences('test4');
+    popover1.showPopover();
+    popover2.showPopover();
+    // Both 1 and 2 should be open at this point.
+    assert_true(popover1.matches(':popover-open'), 'popover1 not open');
+    assert_true(isElementVisible(popover1));
+    assert_true(popover2.matches(':popover-open'), 'popover2 not open');
+    assert_true(isElementVisible(popover2));
+    // This should hide both of them.
+    popover1.hidePopover();
+    await waitForRender();
+    assert_false(popover1.matches(':popover-open'));
+    assert_false(isElementVisible(popover1));
+    assert_false(popover2.matches(':popover-open'));
+    assert_false(isElementVisible(popover2));
+  }, "The popover stack is preserved across shadow-inclusive ancestors");
+</script>
+
+
+<div id=test5>
+  <template shadowrootmode=open>
+    <button popovertarget=p1>Test 5 Popover 1</button>
+    <div popover id=p1>Popover 1
+      <p>This should not get hidden when popover2 opens.</p>
+      <button popovertarget=p2>Click</button>
+    </div>
+    <div popover id=p2>Popover 2
+      <p>This should not hide popover1.</p>
+    </div>
+  </template>
+</div>
+<script>
+  promise_test(async function() {
+    polyfill_declarative_shadow_dom(test5);
+    const [popover1,popover2] = getPopoverReferences('test5');
+    popover1.showPopover();
+    popover1.querySelector('button').click(); // Use invoker to keep 2 visible
+    // Both 1 and 2 should be open at this point.
+    assert_true(popover1.matches(':popover-open'), 'popover1 not open');
+    assert_true(isElementVisible(popover1));
+    assert_true(popover2.matches(':popover-open'), 'popover2 not open');
+    assert_true(isElementVisible(popover2));
+    // This should hide both of them.
+    popover1.hidePopover();
+    await waitForRender();
+    assert_false(popover1.matches(':popover-open'));
+    assert_false(isElementVisible(popover1));
+    assert_false(popover2.matches(':popover-open'));
+    assert_false(isElementVisible(popover2));
+  }, "Popover ancestor relationships are within a root, not within the document");
+</script>