focus-negative-tabindex-at-end-of-shadow-tree.html

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This WPT test may be referenced by the following Test IDs:
- /shadow-dom/focus-navigation/focus-negative-tabindex-at-end-of-shadow-tree.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Tab/Shift+Tab from a tabindex=-1 element at either end of a shadow tree</title>

<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#sequential-navigation-search-algorithm">

<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/testdriver-actions.js"></script>

<script src="resources/focus-utils.js"></script>

<button id="before">before</button>

<div id="host">

  <template shadowrootmode="open">

    <span id="first" tabindex="-1">first</span>

    <button id="inner">inner</button>

    <span id="last" tabindex="-1">last</span>

  </template>

</div>

<button id="after">after</button>

<script>

promise_test(async () => {

  host.shadowRoot.getElementById("last").focus();

  await navigateFocusForward();

  assert_equals(document.activeElement, after);

}, "Tab moves focus past the shadow host, not back to the start of the shadow tree");

promise_test(async () => {

  host.shadowRoot.getElementById("first").focus();

  await navigateFocusBackward();

  assert_equals(document.activeElement, before);

}, "Shift+Tab moves focus before the shadow host, not back to the end of the shadow tree");

</script>