1 files changed, 33 insertions, 0 deletions
diff --git a/testing/web-platform/tests/scroll-to-text-fragment/force-load-at-top.js b/testing/web-platform/tests/scroll-to-text-fragment/force-load-at-top.js
new file mode 100644
index 0000000000..691168859f
--- /dev/null
+++ b/testing/web-platform/tests/scroll-to-text-fragment/force-load-at-top.js
@@ -0,0 +1,33 @@
+function checkScroll() {
+  // Ensure two animation frames on load to test the fallback to element
+  // anchor, which gets queued for the next frame if the text fragment is not
+  // found.
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      let results = {
+        scrolled: (window.pageYOffset != 0),
+      };
+
+      let key = (new URL(document.location)).searchParams.get("key");
+      stashResultsThenClose(key, results);
+    });
+  });
+}
+
+window.addEventListener('pageshow', () => {
+  if (location.hash == "#history") {
+    // This is the "history" test - on the first load we'll navigate to a page
+    // that calls history.back(). When we load a second time (from the back
+    // navigation), record the scroll state at that point to check how history
+    // scroll restoration is handled.
+    if (history.state == null) {
+      history.pushState("test", "test", "");
+      requestAnimationFrame(() => {
+        location.href = "navigate-back.html";
+      });
+      return;
+    }
+  }
+
+  checkScroll();
+});