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[compression dictionary] Add WPT test to check fetch timing for Link header and <link> element. #61030

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Merged
chromium-wpt-export-bot merged 1 commit into from
Jul 2, 2026
Merged

[compression dictionary] Add WPT test to check fetch timing for Link header and <link> element. #61030

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46 changes: 46 additions & 0 deletions fetch/compression-dictionary/dictionary-fetch-timing-001.tentative.https.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<meta name="timeout" content="long"/>
<script src="./resources/compression-dictionary-util.sub.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://github.com/whatwg/html/pull/11620#discussion_r3385960016">
<body>
<script>
compression_dictionary_promise_test(async t => {
let sortedEvents = await new Promise(resolve => {
const iframe = document.createElement("iframe");
iframe.src = "resources/dictionary-fetch-timing-001-subframe.https.html";
window.addEventListener("message", message => resolve(message.data.sortedEvents));
document.body.appendChild(iframe);
t.add_cleanup(() => iframe.remove());
});

// First verify observed fetches and load event...
const fetchedNonDictionaryResources = [
"/common/utils.js",
"/html/semantics/document-metadata/interactions-of-styling-and-scripting/stylesheet.py?delay=1",
"/images/wide-gamut-pattern.png",
];
const fetchedLinkElement = "/fetch/compression-dictionary/resources/register-dictionary.py?linkElement";
const fetchedLinkHeader = "/fetch/compression-dictionary/resources/register-dictionary.py?linkHeader";
const loadEvent = "load event";
let expectedEvents = fetchedNonDictionaryResources.concat([fetchedLinkElement, fetchedLinkHeader, loadEvent]);
assert_array_equals(sortedEvents.toSorted(), expectedEvents.toSorted(), "Expected fetches and loaded events observed.");

// Non-dictionary resources are fetched before dictionary resources.
let indexOfLinkElement = sortedEvents.indexOf(fetchedLinkElement);
let indexOfLinkHeader = sortedEvents.indexOf(fetchedLinkHeader);
for (const resource of fetchedNonDictionaryResources) {
let indexOfResource = sortedEvents.indexOf(resource);
assert_less_than(indexOfResource, indexOfLinkElement, `${resource} fetched before link element with rel=compression-dictionary.`);
assert_less_than(indexOfResource, indexOfLinkHeader, `${resource} fetched before Link header with rel=compression-dictionary.`);
};

// Fetching link header is postponed after page load.
let indexOfLoadEvent = sortedEvents.indexOf(loadEvent);
assert_less_than(indexOfLoadEvent, indexOfLinkHeader, `Link header with rel=compression-dictionary is fetched after page load.`);
}, "Timing of compression dictionary fetches for <link> element and Link header.");
</script>
</body>
32 changes: 32 additions & 0 deletions fetch/compression-dictionary/resources/dictionary-fetch-timing-001-subframe.https.html
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<!DOCTYPE html>
<script>
let timedEntries = [];
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach(entry => {
const url = new URL(entry.name);
timedEntries.push({pathname: url.pathname, search: url.search, time: entry.fetchStart});
});
});
observer.observe({ type: "resource", buffered: true});
</script>
<link rel="compression-dictionary" href="./register-dictionary.py?linkElement">
<link rel="stylesheet" href="/html/semantics/document-metadata/interactions-of-styling-and-scripting/stylesheet.py?delay=1">
<script src="/common/utils.js"></script>
<img src="/images/wide-gamut-pattern.png"/>
<script>
window.addEventListener("load", _ => {
timedEntries.push({name: "load event", time: performance.now()});
function waitForDictionaryLoad() {
if (timedEntries.find(e => e.search === "?linkHeader") &&
timedEntries.find(e => e.search === "?linkElement")) {
let sortedEvents = timedEntries.
sort((entry1, entry2) => entry1.time - entry2.time).
map(entry => entry.name || entry.pathname + entry.search);
window.parent.postMessage({sortedEvents});
return;
}
(window.requestIdleCallback || requestAnimationFrame)(waitForDictionaryLoad);
}
waitForDictionaryLoad();
});
</script>
2 changes: 2 additions & 0 deletions .../compression-dictionary/resources/dictionary-fetch-timing-001-subframe.https.html.headers
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Clear-Site-Data: "cache"
Link: <./register-dictionary.py?linkHeader>; rel="compression-dictionary"
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