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<!DOCTYPE html>
<title>Test prerendering</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/utils.js"></script>
<script src="/common/utils.js"></script>
<body>
<script>
promise_test(async t => {
assert_implements(
'supports' in HTMLScriptElement,
'HTMLScriptElement.supports is not supported');
assert_implements(
HTMLScriptElement.supports('speculationrules'),
'<script type="speculationrules"> is not supported');
const prerender_ready_key = token();
const prerender_loaded_key = token();
const prerender_activated_key = token();
const url = generateURL('resources/prerender-inner.html',
[prerender_ready_key, prerender_loaded_key, prerender_activated_key]);
// TODO: This test expects that the browser always triggers prerendering when
// SpeculationRules is provided. But SpeculationRules allows browsers not to
// trigger the speculative resource loading even if SpeculationRules is
// specified. So we have to use a new WebDriver API that deterministically
// triggers prerendering.
// https://github.com/WICG/nav-speculation/blob/main/speculation-rules-testing.md
const script = document.createElement('script');
script.type = 'speculationrules';
script.text = `{"prerender": [{"source": "list", "urls": ["${url}"] }] }`;
document.head.appendChild(script);
const ready_result = await nextValueFromServer(prerender_ready_key);
assert_equals(ready_result, 'ready');
attachFencedFrame(url);
const loaded_or_acrivated_result = await Promise.race([
nextValueFromServer(prerender_loaded_key),
nextValueFromServer(prerender_activated_key)
]);
assert_equals(loaded_or_acrivated_result, 'loaded');
}, 'Fenced Frame must not load prerendered page.');
</script>
</body>
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