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<!doctype html>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="/preload/resources/preload_helper.js"></script>
<body>
<script>
const {REMOTE_ORIGIN} = get_host_info();
function test_prefetch_change(before, after, expected, label) {
promise_test(async t => {
const link = document.createElement('link');
link.rel = 'prefetch';
t.add_cleanup(() => link.remove());
const loadErrorOrTimeout = () => new Promise(resolve => {
const timeoutMillis = 1000;
link.addEventListener('load', () => resolve('load'));
link.addEventListener('error', () => resolve('error'));
t.step_timeout(() => resolve('timeout'), timeoutMillis);
});
for (const attr in before)
link.setAttribute(attr, before[attr]);
document.head.appendChild(link);
const result1 = await loadErrorOrTimeout();
for (const attr in after) {
if (attr in before && after[attr] === null)
link.removeAttribute(attr);
else
link.setAttribute(attr, after[attr]);
}
const result2 = await loadErrorOrTimeout();
assert_array_equals([result1, result2], expected);
}, label);
}
test_prefetch_change(
{href: '/common/square.png?1'},
{href: '/common/square.png?2'},
['load', 'load'],
'Changing a prefetch href should trigger a fetch');
test_prefetch_change(
{href: `${REMOTE_ORIGIN}/common/square.png?pipe=header(Access-Control-Allow-Origin,*)`},
{href: `${REMOTE_ORIGIN}/common/square.png?pipe=header(Access-Control-Allow-Origin,*)`, crossorigin: 'anonymous'},
['load', 'timeout'],
'Changing a prefetch crossorigin attribute does not trigger a fetch');
</script>
</body>
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