1 files changed, 51 insertions, 0 deletions
diff --git a/testing/web-platform/tests/hr-time/resources/unload.js b/testing/web-platform/tests/hr-time/resources/unload.js
new file mode 100644
index 0000000000..ab6b121c2b
--- /dev/null
+++ b/testing/web-platform/tests/hr-time/resources/unload.js
@@ -0,0 +1,51 @@
+const syncDelay = ms => {
+  const start = performance.now();
+  let elapsedTime;
+  do {
+    elapsedTime = performance.now() - start;
+  } while (elapsedTime < ms);
+};
+
+const markTime = (docName, lifecycleEventName) => {
+  // Calculating these values before the below `mark` invocation ensures that delays in
+  // reaching across to the other window object doesn't interfere with the correctness
+  // of the test.
+  const dateNow = Date.now();
+  const performanceNow = performance.now();
+
+  window.opener.mark({
+    docName,
+    lifecycleEventName,
+    performanceNow: performanceNow,
+    dateNow: dateNow
+  });
+};
+
+const setupUnloadPrompt = (docName, msg) => {
+  window.addEventListener("beforeunload", ev => {
+    markTime(docName, "beforeunload");
+    return ev.returnValue = msg || "Click OK to continue test."
+  });
+};
+
+const setupListeners = (docName, nextDocument) => {
+  window.addEventListener("load", () => {
+    markTime(docName, "load");
+    document.getElementById("proceed").addEventListener("click", ev => {
+      ev.preventDefault();
+      if (nextDocument) {
+        document.location = nextDocument;
+      } else {
+        window.close();
+      }
+    })
+  });
+
+  setupUnloadPrompt(docName);
+
+  window.addEventListener("unload", () => {
+    markTime(docName, "unload");
+    if (docName !== "c") { syncDelay(1000); }
+  });
+};
+