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const EMPTY_TOPICS_HEADER = '();p=P0000000000000000000000000000000';
function test_topics_iframe_navigation_header(
test, has_browsing_topics_attribute, is_same_origin, expect_topics_header_available_func) {
const same_origin_src = '/browsing-topics/resources/check-topics-request-header-notify-parent.py';
same_origin_src;
let frame = document.createElement('iframe');
frame.src = is_same_origin ? same_origin_src : cross_origin_src;
if (has_browsing_topics_attribute) {
frame.browsingTopics = true;
}
window.addEventListener('message', test.step_func(function handler(evt) {
if (evt.source === frame.contentWindow) {
expect_topics_header_available_func(evt.data);
document.body.removeChild(frame);
window.removeEventListener('message', handler);
test.done();
}
}));
document.body.appendChild(frame);
}
function expect_topics_header_unavailable(data) {
assert_equals(data.topicsHeader, 'NO_TOPICS_HEADER');
}
function expect_topics_header_available(data) {
// An empty result indicates that the request was eligible for topics.
// Currently, the web-platform-tests framework does not support actually
// handling the topics request.
assert_equals(data.topicsHeader, EMPTY_TOPICS_HEADER);
}