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chromium/third_party/blink/web_tests/wpt_internal/badging/badge-success.https.html 

<!DOCTYPE html>
<html>
<head>
<title>Correct interpretation of valid badge values.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script type="module">
import {badge_test} from './resources/mock-badge-service.js';

badge_test(() => navigator.setAppBadge(), 'flag');

badge_test(() => navigator.setAppBadge(undefined), 'flag');

badge_test(() => navigator.setAppBadge(1), 'number:1');

// Non-whole number should round down to nearest integer.
badge_test(() => navigator.setAppBadge(10.6), 'number:10');

// Maximum allowed value (2^53 - 1).
badge_test(() => navigator.setAppBadge(Number.MAX_SAFE_INTEGER),
           'number:' + Number.MAX_SAFE_INTEGER);

// Setting the Badge to 0 should be equivalent to clearing the badge.
badge_test(() => navigator.setAppBadge(0), 'clear');

badge_test(() => navigator.clearAppBadge(), 'clear');

// Non-numeric values that convert to integer.
badge_test(() => navigator.setAppBadge(null), 'clear');
badge_test(() => navigator.setAppBadge(false), 'clear');
badge_test(() => navigator.setAppBadge(true), 'number:1');
badge_test(() => navigator.setAppBadge('3'), 'number:3');

</script>
</body>
</html>