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<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: focus - the sequential focus navigation order with shadow dom with varying tabindex values</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#sequential-focus-navigation">
<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>
<script src="resources/shadow-utils.js"></script>
<body>
<script>
promise_test(async () => {
function createButtonInShadowDOM(host) {
const root = host.attachShadow({mode: "open"});
root.innerHTML = "<input>";
document.body.appendChild(host);
return root;
}
const host1 = document.createElement("div");
const root1 = createButtonInShadowDOM(host1);
const forwarder = document.createElement("div");
forwarder.setAttribute("tabindex", 0);
document.body.appendChild(forwarder);
const host2 = document.createElement("div");
host2.setAttribute("tabindex", -1);
const root2 = createButtonInShadowDOM(host2);
const host3 = document.createElement("div");
const root3 = createButtonInShadowDOM(host3);
root1.querySelector("input").focus();
let forwarderFocused = false;
forwarder.addEventListener("focus", () => {
forwarderFocused = true;
root2.querySelector("input").focus();
});
// Structure:
// <div #host1></div>
// #ShadowRoot
// <button>Button</button>
// <div #forwarder tabindex=0></div>
// <div #host2 tabindex=-1></div>
// #ShadowRoot
// <button>Button</button>
// <div #host3></div>
// #ShadowRoot
// <button>Button</button>
assert_equals(document.activeElement, host1);
assert_equals(root1.activeElement, root1.querySelector("input"));
await navigateFocusForward();
assert_true(forwarderFocused);
assert_equals(document.activeElement, host2);
assert_equals(root2.activeElement, root2.querySelector("input"));
// In buggy Firefox build, the following focus navigation will
// move the focus back to #host1's button.
await navigateFocusForward();
assert_equals(document.activeElement, host3);
assert_equals(root3.activeElement, root3.querySelector("input"));
}, "Order with different tabindex on host")
</script>
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