Add example throttle js test script

examples/throttle.js

@@ -0,0 +1,56 @@
+import { browser } from 'k6/x/browser';
+
+export const options = {
+  scenarios: {
+    normal: {
+      executor: 'shared-iterations',
+      options: {
+        browser: {
+            type: 'chromium',
+        },
+      },
+      exec: 'normal',
+    },
+    throttled: {
+      executor: 'shared-iterations',
+      options: {
+        browser: {
+            type: 'chromium',
+        },
+      },
+      exec: 'throttled',
+    },
+  },
+  thresholds: {
+    'browser_http_req_duration{scenario:normal}': ['p(99)<500'],
+    'browser_http_req_duration{scenario:throttled}': ['p(99)<1500'],
+  },
+}
+
+export async function normal() {
+  const context = browser.newContext();
+  const page = context.newPage();
+
+  try {
+    await page.goto('https://test.k6.io/', { waitUntil: 'networkidle' });
+  } finally {
+    page.close();
+  }
+}
+
+export async function throttled() {
+  const context = browser.newContext();
+  const page = context.newPage();
+
+  try {
+    page.throttleNetwork({
+      latency: 750,
+      downloadThroughput: 250,
+      uploadThroughput: 250,
+    });
+
+    await page.goto('https://test.k6.io/', { waitUntil: 'networkidle' });
+  } finally {
+    page.close();
+  }
+}