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Test Info:

<!doctype html>
<body>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/common/utils.js></script>
<script src=/browsing-topics/resources/load_img.sub.js></script>
<script>
const EMPTY_TOPICS_HEADER = '();p=P0000000000000000000000000000000';
promise_test(async () => {
const topics_header = await load_topics_image(
/*has_browsing_topics_attribute=*/false, /*is_same_origin=*/true);
assert_equals(topics_header, 'NO_TOPICS_HEADER');
}, 'test <img src=[url]></img>');
promise_test(async () => {
const topics_header = await load_topics_image(
/*has_browsing_topics_attribute=*/true, /*is_same_origin=*/true);
assert_equals(topics_header, EMPTY_TOPICS_HEADER);
}, 'test <img browsingtopics src=[url]></img>');
</script>
</body>