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<!DOCTYPE html>
<meta charset="utf-8" />
<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="/soft-navigation-heuristics/resources/soft-navigation-test-helper.js"></script>
<button id="navigateButton">Click here!</button>
<h1>Heading!</h1>
<div id="content" elementtiming="content-text">Initial Text</div>
<div id="container"></div>
<script>
promise_test(async t => {
const url = 'soft-nav-1';
// Wait for the initial text load and make its way through the text timing
// pipeline before changing its contents.
const elementId = "content-text";
let entries = await new Promise(resolve => {
new PerformanceObserver((list, observer) => {
resolve(list.getEntries());
observer.disconnect();
}).observe({type: 'element', buffered: true});
});
assert_equals(
entries.length, 1,
`Expected exactly one ElementTiming entry for "${elementId}"`);
assert_equals(
entries[0].identifier, elementId,
`Unexpected ElementTiming entry: expected "${elementId}"`);
const softNavPromise = SoftNavigationTestHelper.getPerformanceEntries(
"soft-navigation",
/* includeSoftNavigationObservations= */true,
/* minNumEntries= */ 1);
let icpPromise = SoftNavigationTestHelper.getPerformanceEntries(
"interaction-contentful-paint",
/* includeSoftNavigationObservations= */true,
/* minNumEntries= */ 1);
const {promise, resolve} = Promise.withResolvers();
navigateButton.addEventListener('click', async () => {
// This is sufficient to trigger an initial soft nav and ICP entry.
history.pushState({}, '', url);
content.innerText = 'This is some new text!';
// Wait for the first round of soft nav/ICP checking.
await promise;
// Add more text, which should produce another ICP entry.
container.innerHTML = `<div id="container-text">${content.innerText} (and more text)</div>`;
// Now, update the same text as before with even more text than above.
// We shouldn't get an ICP entry for this, even though it's larger,
// because we already have an entry for this node.
content.innerText = content.innerText + ' (and even more text)';
}, {once: true});
if (test_driver) {
test_driver.click(navigateButton);
}
const helper = new SoftNavigationTestHelper(t);
// Check if we detected a soft nav.
const softNavs = await helper.withTimeoutMessage(
softNavPromise, "Soft navigation not detected.", /*timeout=*/ 3000);
assert_equals(softNavs.length, 1, 'Expected exactly one soft navigation.');
assert_true(
softNavs[0].name.endsWith(url),
`Unexpected Soft Navigation URL. Expected url to end with ${url} but got ${softNavs[0].name}`);
// Check that we only get one ICP entry, and that it's for the node whose
// text we overwrote.
let icps = await helper.withTimeoutMessage(
icpPromise, 'ICP not detected.', /*timeout=*/ 3000);
assert_equals(icps.length, 1, 'Expected exactly one ICP entry.');
assert_equals(icps[0].id, 'content', 'Expected ICP candidate to be "content"');
// Set things up for the next ICP entry.
icpPromise = SoftNavigationTestHelper.getPerformanceEntries(
"interaction-contentful-paint",
/* includeSoftNavigationObservations= */true,
/* minNumEntries= */ 1);
resolve();
icps = await helper.withTimeoutMessage(
icpPromise, 'New ICP not detected.', /*timeout=*/ 3000);
assert_equals(icps.length, 1, 'Expected exactly one ICP entry.');
assert_equals(icps[0].id, 'container-text', 'Expected ICP candidate to be "container-text"');
}, 'Soft Navigation Detection supports replacing existing text once per interaction');
</script>
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