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<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: DocumentOrShadowRoot.activeElement</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<body>
<script>
function createChildAndFocus(focusParent) {
const focused = document.createElement("div");
focused.tabIndex = 0;
focusParent.appendChild(focused);
focused.focus();
return focused;
}
test(() => {
const host = document.createElement("div");
const shadowRoot = host.attachShadow({ mode: "open" });
document.body.appendChild(host);
const focused = createChildAndFocus(shadowRoot);
assert_equals(document.activeElement, host);
assert_equals(shadowRoot.activeElement, focused);
}, "activeElement on document & shadow root when focused element is in the shadow tree");
test(() => {
const host = document.createElement("div");
const shadowRoot = host.attachShadow({ mode: "open" });
document.body.appendChild(host);
const focused = createChildAndFocus(document.body);
assert_equals(document.activeElement, focused);
assert_equals(shadowRoot.activeElement, null);
}, "activeElement on document & shadow root when focused element is in the document");
test(() => {
const host = document.createElement("div");
const shadowRoot = host.attachShadow({ mode: "open" });
shadowRoot.appendChild(document.createElement("slot"));
document.body.appendChild(host);
// Child of |host|, will be slotted to the slot in |shadowRoot|.
const focused = createChildAndFocus(host);
assert_equals(document.activeElement, focused);
assert_equals(shadowRoot.activeElement, null);
}, "activeElement on document & shadow root when focused element is slotted");
test(() => {
const host = document.createElement("div");
const shadowRoot = host.attachShadow({ mode: "open" });
document.body.appendChild(host);
const neighborHost = document.createElement("div");
const neighborShadowRoot = neighborHost.attachShadow({ mode: "open" });
document.body.appendChild(neighborHost);
const focused = createChildAndFocus(shadowRoot);
assert_equals(document.activeElement, host);
assert_equals(shadowRoot.activeElement, focused);
assert_equals(neighborShadowRoot.activeElement, null);
}, "activeElement on a neighboring host when focused element is in another shadow tree");
test(() => {
const host = document.createElement("div");
const shadowRoot = host.attachShadow({ mode: "open" });
document.body.appendChild(host);
const nestedHost = document.createElement("div");
const nestedShadowRoot = nestedHost.attachShadow({ mode: "open" });
shadowRoot.appendChild(nestedHost);
const focused = createChildAndFocus(nestedShadowRoot);
assert_equals(document.activeElement, host);
assert_equals(shadowRoot.activeElement, nestedHost);
assert_equals(nestedShadowRoot.activeElement, focused);
}, "activeElement when focused element is in a nested shadow tree");
test(() => {
const host = document.createElement("div");
const shadowRoot = host.attachShadow({ mode: "open" });
document.body.appendChild(host);
const nestedHost = document.createElement("div");
const nestedShadowRoot = nestedHost.attachShadow({ mode: "open" });
shadowRoot.appendChild(nestedHost);
const focused = createChildAndFocus(shadowRoot);
assert_equals(document.activeElement, host);
assert_equals(shadowRoot.activeElement, focused);
assert_equals(nestedShadowRoot.activeElement, null);
}, "activeElement when focused element is in a parent shadow tree");
</script>
</body>
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