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diff --git a/testing/web-platform/tests/speculation-rules/prefetch/initiators-a-element.sub.https.html b/testing/web-platform/tests/speculation-rules/prefetch/initiators-a-element.sub.https.html
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+++ b/testing/web-platform/tests/speculation-rules/prefetch/initiators-a-element.sub.https.html
@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<meta name="variant" content="?cross-site">
+<meta name="variant" content="?same-site">
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script src="/common/utils.js"></script>
+<script src="resources/utils.sub.js"></script>
+<script>
+ // In https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate,
+ // `sourceDocument` (instead of `navigable`'s active document) should be
+ // used as the referring document for prefetch.
+ promise_test(async t => {
+ assert_implements(HTMLScriptElement.supports('speculationrules'), "Speculation Rules not supported");
+
+ const win = await spawnWindow(t, { protocol: 'https' });
+
+ const hostname =
+ location.search === '?cross-site' ? '{{hosts[alt][www]}}' : undefined;
+ const nextUrl = win.getExecutorURL({ protocol: 'https', hostname, page: 2 });
+
+ await win.forceSinglePrefetch(nextUrl);
+
+ // sourceDocument == `win`'s Document == active document of window being
+ // navigated.
+ await win.execute_script((url) => {
+ window.executor.suspend(() => {
+ const a = document.createElement('a');
+ a.setAttribute('href', url);
+ document.body.appendChild(a);
+ a.click();
+ });
+ }, [nextUrl]);
+
+ assert_equals(
+ await win.execute_script(() => location.href),
+ nextUrl.toString(),
+ "expected navigation to reach destination URL");
+
+ assert_prefetched(await win.getRequestHeaders());
+ }, `<a>`);
+
+ promise_test(async t => {
+ assert_implements(HTMLScriptElement.supports('speculationrules'), "Speculation Rules not supported");
+
+ const win = await spawnWindow(t, { protocol: 'https' });
+
+ const hostname =
+ location.search === '?cross-site' ? '{{hosts[alt][www]}}' : undefined;
+ const nextUrl = win.getExecutorURL({ protocol: 'https', hostname, page: 2 });
+
+ await win.forceSinglePrefetch(nextUrl);
+
+ // sourceDocument == `win`'s Document != active document of window being
+ // navigated, since the window being navigated is a new window.
+ await win.execute_script((url) => {
+ window.executor.suspend(() => {
+ const a = document.createElement('a');
+ a.setAttribute('href', url);
+ a.setAttribute('target', '_blank');
+ document.body.appendChild(a);
+ a.click();
+ });
+ }, [nextUrl]);
+
+ // Below, the scripts given to `win.execute_script()` are executed on the
+ // `nextUrl` page in the new window, because `window.executor.suspend()`
+ // above made `win`'s original page stop processing `execute_script()`,
+ // while the new page of `nextUrl` in the new window starts processing
+ // `execute_script()` for the same ID.
+ assert_equals(
+ await win.execute_script(() => location.href),
+ nextUrl.toString(),
+ "expected navigation to reach destination URL");
+
+ assert_prefetched(await win.getRequestHeaders());
+ }, `<a target="blank">`);
+</script>