1 files changed, 31 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/location-assign-during-pageshow.html b/testing/web-platform/tests/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/location-assign-during-pageshow.html
new file mode 100644
index 0000000000..0f84cbe246
--- /dev/null
+++ b/testing/web-platform/tests/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/location-assign-during-pageshow.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/helpers.js"></script>
+
+<body>
+<script>
+"use strict";
+promise_test(async t => {
+  const sentinelIframe = await setupSentinelIframe(t);
+  const startingHistoryLength = history.length;
+
+  const code = `
+    window.onpageshow = () => {
+      location.assign("/common/blank.html?thereplacement");
+    };
+  `;
+
+  const startURL = "resources/code-injector.html?pipe=sub(none)&code=" + encodeURIComponent(code);
+  const afterReplacementURL = "/common/blank.html?thereplacement";
+  const iframe = insertIframe(t, startURL);
+  assert_equals(history.length, startingHistoryLength, "Inserting the under-test iframe must not change history.length");
+
+  await waitForLoadAllowingIntermediateLoads(t, iframe, afterReplacementURL);
+  assert_equals(history.length, startingHistoryLength, "history.length must not change after waiting for the replacement");
+
+  await checkSentinelIframe(t, sentinelIframe);
+  assert_equals(history.length, startingHistoryLength, "history.length must not change after checking the sentinel iframe");
+}, "Replace during the pageshow event, triggered by location.assign()");
+</script>