From 9312049c8b79f8761d854048e0a183f55b61651c Mon Sep 17 00:00:00 2001
From: AcidicSoil <claytonbivens1@gmail.com>
Date: Fri, 4 Sep 2026 19:27:05 -0500
Subject: [PATCH] fix(browser): use monotonic capture timeout

---
 src/browser/dom-helpers.test.ts | 19 +++++++++++++++++++
 src/browser/dom-helpers.ts      |  4 ++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/browser/dom-helpers.test.ts b/src/browser/dom-helpers.test.ts
index bf644783..1acd859a 100644
--- a/src/browser/dom-helpers.test.ts
+++ b/src/browser/dom-helpers.test.ts
@@ -49,6 +49,25 @@ describe('waitForCaptureJs', () => {
     delete g.window;
   });
 
+  it('uses monotonic elapsed time when the wall clock jumps forward', async () => {
+    const g = globalThis as unknown as Record<string, unknown>;
+    const captured: unknown[] = [];
+    const originalDateNow = Date.now;
+    let calls = 0;
+    g.__webcmd_xhr = captured;
+    g.window = g;
+    Date.now = () => (calls++ === 0 ? 0 : 60_000);
+    try {
+      const promise = eval(waitForCaptureJs(200)) as Promise<string>;
+      setTimeout(() => captured.push({ data: 'late after wall-clock jump' }), 20);
+      await expect(promise).resolves.toBe('captured');
+    } finally {
+      Date.now = originalDateNow;
+      delete g.__webcmd_xhr;
+      delete g.window;
+    }
+  });
+
   it('resolves immediately when __webcmd_xhr already has data', async () => {
     const g = globalThis as unknown as Record<string, unknown>;
     g.__webcmd_xhr = [{ data: 'already here' }];
diff --git a/src/browser/dom-helpers.ts b/src/browser/dom-helpers.ts
index 3453e7b2..ce8a1e26 100644
--- a/src/browser/dom-helpers.ts
+++ b/src/browser/dom-helpers.ts
@@ -213,10 +213,10 @@ export function waitForDomStableJs(maxMs: number, quietMs: number): string {
 export function waitForCaptureJs(maxMs: number): string {
   return `
     new Promise((resolve, reject) => {
-      const deadline = Date.now() + ${maxMs};
+      const deadline = performance.now() + ${maxMs};
       const check = () => {
         if ((window.__webcmd_xhr || []).length > 0) return resolve('captured');
-        if (Date.now() > deadline) return reject(new Error('No network capture within ${maxMs / 1000}s'));
+        if (performance.now() > deadline) return reject(new Error('No network capture within ${maxMs / 1000}s'));
         setTimeout(check, 100);
       };
       check();