diff --git a/speculation-rules/prefetch/initiators-a-element.sub.https.html b/speculation-rules/prefetch/initiators-a-element.sub.https.html
new file mode 100644
index 00000000000000..bac5eb7cb794e0
--- /dev/null
+++ b/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>
diff --git a/speculation-rules/prefetch/initiators-iframe-location-href.sub.https.html b/speculation-rules/prefetch/initiators-iframe-location-href.sub.https.html
new file mode 100644
index 00000000000000..9d6702d4b752ad
--- /dev/null
+++ b/speculation-rules/prefetch/initiators-iframe-location-href.sub.https.html
@@ -0,0 +1,48 @@
+<!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);
+
+    // In https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate,
+    // `sourceDocument` is the incumbent Document and thus `win`'s Document.
+    // `navigable`'s active document is `iframe`'s Document.
+    await win.execute_script((url) => {
+      window.executor.suspend(() => {
+        const iframe = document.createElement('iframe');
+        document.body.appendChild(iframe);
+        iframe.contentWindow.location.href = url;
+      });
+    }, [nextUrl]);
+
+    // Below, the scripts given to `win.execute_script()` are executed on the
+    // `nextUrl` page in the iframe, because `window.executor.suspend()` above
+    // made `win`'s original page stop processing `execute_script()`,
+    // while the new page of `nextUrl` in the iframe 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());
+  }, `location.href across iframe`);
+</script>
diff --git a/speculation-rules/prefetch/initiators-window-open.sub.https.html b/speculation-rules/prefetch/initiators-window-open.sub.https.html
new file mode 100644
index 00000000000000..f786df077dbfe1
--- /dev/null
+++ b/speculation-rules/prefetch/initiators-window-open.sub.https.html
@@ -0,0 +1,68 @@
+<!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);
+
+    await win.execute_script((url) => {
+      window.executor.suspend(() => {
+        window.open(url, "_blank");
+      });
+    }, [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. Same for below.
+    assert_equals(
+        await win.execute_script(() => location.href),
+        nextUrl.toString(),
+        "expected navigation to reach destination URL");
+
+    assert_prefetched(await win.getRequestHeaders());
+  }, `window.open()`);
+
+  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);
+
+    await win.execute_script((url) => {
+      window.executor.suspend(() => {
+        window.open(url, "_blank", "noopener");
+      });
+    }, [nextUrl]);
+
+    assert_equals(
+        await win.execute_script(() => location.href),
+        nextUrl.toString(),
+        "expected navigation to reach destination URL");
+
+    assert_prefetched(await win.getRequestHeaders());
+  }, `window.open(noopener)`);
+</script>
diff --git a/speculation-rules/prefetch/prefetch-traverse-reload.sub.html b/speculation-rules/prefetch/prefetch-traverse-reload.sub.html
index 3f1312ed1222ad..ec6a7cd9261579 100644
--- a/speculation-rules/prefetch/prefetch-traverse-reload.sub.html
+++ b/speculation-rules/prefetch/prefetch-traverse-reload.sub.html
@@ -28,6 +28,36 @@
   assert_prefetched(await agent.getRequestHeaders(), "traversal should use prefetch");
 }, "prefetches can be used for traversal navigations");
 
+promise_test(async t => {
+  assert_implements(HTMLScriptElement.supports('speculationrules'), "Speculation Rules not supported");
+
+  let agent = await spawnWindow(t, { protocol: 'https', pipe: 'header(Cache-Control, no-store)' });
+  let previousUrl = await agent.execute_script(() => location.href);
+  await agent.execute_script(async () => {
+    window.preventBfcache = new WebSocket('wss://{{ports[wss][0]}}/echo');
+  });
+
+  let nextUrl = agent.getExecutorURL({ protocol: 'https', page: 2 });
+  await agent.navigate(nextUrl);
+
+  await agent.forceSinglePrefetch(previousUrl);
+  // In https://html.spec.whatwg.org/multipage/nav-history-apis.html#delta-traverse,
+  // `sourceDocument` is `History`'s relevant global object's associated
+  // Document. In this case, it's `iframe.contentDocument`, and thus the
+  // prefetch from `win`'s Document (iframe's parent Document) isn't used.
+  await agent.execute_script(() => {
+    window.executor.suspend(() => {
+      const iframe = document.createElement('iframe');
+      document.body.appendChild(iframe);
+      iframe.contentWindow.history.go(-1);
+    });
+  });
+
+  assert_equals(previousUrl, await agent.execute_script(() => location.href));
+  assert_not_prefetched(await agent.getRequestHeaders(),
+      "prefetch from different Document should not be used");
+}, "History's Document is used for traversal navigations");
+
 promise_test(async t => {
   assert_implements(HTMLScriptElement.supports('speculationrules'), "Speculation Rules not supported");
 
diff --git a/speculation-rules/prerender/prefetch.https.html b/speculation-rules/prerender/prefetch.https.html
index 48de5adca13e0a..2a1553b3d94bb7 100644
--- a/speculation-rules/prerender/prefetch.https.html
+++ b/speculation-rules/prerender/prefetch.https.html
@@ -15,7 +15,7 @@
       await create_prerendered_page(t, {}, {prefetch: true}, {});
 
   assert_equals(await tryToActivate(), 'activated');
-  assert_equals(await getNetworkRequestCount(), '2', 'Network request count');
-}, "Prerender navigation requests don't use prefetched results (for now)");
+  assert_equals(await getNetworkRequestCount(), '1', 'Network request count');
+}, "Prerender navigation requests should use prefetched results");
 </script>
 </body>
