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<!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>
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