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Test Info: Warnings

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: focus - document has system focus</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<input id="input">
promise_test(async t => {
await new Promise(r => window.onload = r);
// This test requires the document to have focus as a starting condition.
// Whether a newly loaded page receives focus or not, seems to be somewhat
// browser-dependent and situation-dependent. For instance, Firefox appears to
// focus the page immediately if the page was loaded with the refresh button,
// but not if it was loaded from pressing ENTER in the URL bar. To ensure a
// reliable starting condition for this test, we give an extra push for focus.
if (!document.hasFocus()) {
const input = document.getElementById("input");
await new Promise(r => input.onfocus = r);
assert_true(document.hasFocus(), "Document has focus as starting condition.");
let gotBlur = false;
window.onblur = () => gotBlur = true;
const popup ="support/popup.html", "otherwindow", "resizable");
assert_not_equals(popup, null, "Test requires popup be opened");
t.add_cleanup(() => popup.close());
const msg = await new Promise(r => window.onmessage = ({data}) => r(data));
assert_equals(msg, "focus = true",
"Test requires popups be focused (may require harness flags)");
assert_true(gotBlur, "Document received blur event when popup opened");
assert_false(document.hasFocus(), "Document lost focus when popup opened");
const p = new Promise(r => window.onfocus = r);
await p;
assert_true(true, "Document received focus event when popup closed");
assert_true(document.hasFocus(), "Document regained focus when popup closed");
}, "Top-level document receives blur/focus events and loses system focus " +
"during opening/closing of a popup");