firefox-main/testing/web-platform/tests/speculation-rules/prerender/activation-by-form-submission.https.html

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<!DOCTYPE html>
<title>Prerender activation by form submission</title>
<meta name="variant" content="?target_hint=_self">
<meta name="variant" content="?target_hint=_blank">
<meta name="variant" content="?rule=prerender_until_script&target_hint=_self">
<meta name="variant" content="?rule=prerender_until_script&target_hint=_blank">
<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/dispatcher/dispatcher.js"></script>
<script src="/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.js"></script>
<body>
<script>
setup(() => assertSpeculationRulesIsSupported('prerender'));
promise_test(async t => {
const rcHelper = new PrerenderingRemoteContextHelper();
const referrerRC = await rcHelper.addWindow(undefined, { features: 'noopener' });
const params = new URLSearchParams(window.location.search);
const rule = params.get('rule') || 'prerender';
const target_hint = getTargetHint();
const uid = token();
const prerenderedRC = await referrerRC.addPreload(rule, {
extrasInSpeculationRule: { form_submission: true, target_hint },
scripts: [`/speculation-rules/prerender/resources/key-value-store.py?key=${uid}&value=ok`]
});
await referrerRC.executeScript((hint) => {
window.target_hint = hint;
}, [target_hint]);
const navigateFn = (url) => {
const form = document.createElement('form');
const urlObj = new URL(url);
form.action = urlObj.origin + urlObj.pathname;
form.method = 'GET';
form.target = window.target_hint;
if (window.target_hint === '_blank') {
form.setAttribute('rel', 'noopener');
}
// Add parameters as hidden inputs dynamically
const extraParams = new URLSearchParams(urlObj.search);
for (const [key, value] of extraParams.entries()) {
const input = document.createElement('input');
input.type = 'hidden';
input.name = key;
input.value = value;
form.appendChild(input);
}
document.body.appendChild(form);
form.submit();
};
if (rule === 'prerender_until_script') {
// For prerender_until_script, we cannot execute scripts before activation.
// So we wait until the prerendered page fetches the key-value-store script.
while (true) {
const response = await fetch(`/speculation-rules/prerender/resources/key-value-store.py?key=${uid}`);
const text = await response.text();
if (text === 'ok') {
break;
}
await new Promise(r => t.step_timeout(r, 100));
}
await referrerRC.executeScript(navigateFn, [prerenderedRC.url]);
// Check it was a prerender activation.
const is_prerender = await prerenderedRC.executeScript(() => {
const entries = performance.getEntriesByType('navigation');
return entries.length > 0 && entries[0].activationStart > 0;
});
assert_true(is_prerender, 'The document was not activated from a prerender');
} else {
await referrerRC.navigateExpectingPrerenderingActivation(prerenderedRC, navigateFn);
}
}, "Prerender activation by form submission");
</script>