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Test Info:

<!DOCTYPE html>
<meta name="timeout" content="long">
<script src="/common/utils.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.js"></script>
setup(() => assertSpeculationRulesIsSupported());
promise_test(async t => {
// The key used for storing a test result in the server.
const key = token();
// Open the test runner in a popup - it will prerender itself, record the
// test results, and send them back to this harness.
const url = `resources/prerender-state.html?key=${key}`;, '_blank', 'noopener');
// Wait until the test sends us the results.
let result = await nextValueFromServer(key);
result = JSON.parse(result);
assert_equals(result.prerenderingTypeOf, "boolean",
"typeof(document.prerendering) is 'boolean'.");
assert_equals(result.onprerenderingChangeTypeOf, "object",
"typeof(document.onprerenderingchange) is 'object'.");
result.onprerenderingchangeCalledBeforeActivate, false,
"prerenderingchange event should not be called prior to activation.");
result.prerenderingValueBeforeActivate, true,
"document.prerendering should be true prior to activation.");
assert_equals(result.onprerenderingchangeCalledAfterActivate, true,
"prerenderingchange event should be called after activation.");
assert_equals(result.prerenderingValueAfterActivate, false,
"document.prerendering should be false after activation.");
assert_equals(result.eventBubbles, false,
"prerenderingchange event.bubbles should be false.");
assert_equals(result.eventCancelable, false,
"prerenderingchange event.cancelable should be false.");
}, 'Test document.prerendering and its change event.');