test_focus_shadow_dom_root.html

Enable keyboard shortcuts

<!doctype html>

<title>Test for bug 1544826</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<script src="/tests/SimpleTest/EventUtils.js"></script>

<div id="host"><a href="#" id="slotted">This is focusable too</a></div>

<script>

  const host = document.getElementById("host");

  const shadow = host.attachShadow({ mode: "open" });

  shadow.innerHTML = `

    <a id="shadow-1" href="#">This is focusable</a>

    <slot></slot>

    <a id="shadow-2" href="#">So is this</a>

`;

  document.documentElement.remove();

  document.appendChild(host);

  SimpleTest.waitForExplicitFinish();

  SimpleTest.waitForFocus(async function() {

    // Enable Full Keyboard Access emulation on Mac.

    if (navigator.platform.indexOf("Mac") === 0) {

      await SpecialPowers.pushPrefEnv({"set": [["accessibility.tabfocus", 7]]});

    is(document.documentElement, host, "Host is the document element");

    host.offsetTop;

    synthesizeKey("KEY_Tab");

    is(shadow.activeElement.id, "shadow-1", "First link in Shadow DOM is focused");

    synthesizeKey("KEY_Tab");

    is(document.activeElement.id, "slotted", "Slotted link is focused");

    synthesizeKey("KEY_Tab");

    is(shadow.activeElement.id, "shadow-2", "Second link in Shadow DOM is focused");

    // Now backwards.

    synthesizeKey("KEY_Tab", {shiftKey: true});

    is(document.activeElement.id, "slotted", "Backwards: Slotted link is focused");

    synthesizeKey("KEY_Tab", {shiftKey: true});

    is(shadow.activeElement.id, "shadow-1", "Backwards: First slotted link is focused");

    SimpleTest.finish();

});

</script>