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chromium/third_party/blink/web_tests/fast/domurl/url-password.html 

<!DOCTYPE HTML>
<link rel="help" href="http://url.spec.whatwg.org/#dom-url-password">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>

test(function() {
    var url = new URL('http://www.domain.com/');
    assert_equals(url.password, '');

    url = new URL('http://user:[email protected]/');
    assert_equals(url.password, 'pass');

    url.password = 'changed';
    assert_equals(url.toString(), 'http://user:[email protected]/');

    url.password = '';
    assert_equals(url.toString(), 'http://[email protected]/');
}, 'password property');

test(function() {
    var url = new URL('about:test');
    assert_equals(url.password, '');

    url.password = 'pass';
    assert_equals(url.password, '');
    assert_equals(url.toString(), 'about:test');
}, 'password property on non relative URL');

test(function() {
    var url = new URL('http://user:[email protected]/');
    var expected = 'oldpass';
    assert_equals(url.password, expected);

    assert_throws_js(TypeError, () => { url.href = 'invalid'; });
    assert_equals(url.password, expected);

    url.password = 'pass';
    assert_equals(url.password, 'pass');
    assert_equals(url.href, 'http://user:[email protected]/');
}, 'password property invalid URL');

</script>