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<!doctype html>
<meta charset=utf-8>
<title>focus move tests caused by a call of Selection.addRange()</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="host"></div>
<script>
let host = document.getElementById("host");
let shadow = host.attachShadow({ mode: "open", delegatesFocus: true });
shadow.innerHTML = `<button>Focusable</button>`;
test(function() {
assert_true(SpecialPowers.Services.focus.elementIsFocusable(host, 0), "host is focusable");
host.focus();
assert_equals(document.activeElement, host, "Host is focused");
assert_equals(shadow.activeElement, shadow.querySelector("button"), "Button is focused");
assert_true(SpecialPowers.Services.focus.elementIsFocusable(host, 0), "host is still focusable");
}, "isElementFocusable with delegateFocus");
</script>
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