From ee765e241ec8338b4a6e3c44e5864a2bce630e5d Mon Sep 17 00:00:00 2001
From: Tim Ledbetter <timledbetter@gmail.com>
Date: Mon, 26 Feb 2024 17:52:03 +0000
Subject: [PATCH] LibWeb: Allow performance timestamps to have sub-millisecond
 precision

Rather than returning the number of whole elapsed milliseconds, we now
return the number of elapsed nanoseconds divided by one million. This
allows us to make use of the fractional part of the double that is
returned.
---
 Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp | 2 +-
 Userland/Libraries/LibWeb/HighResolutionTime/Performance.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp
index 865300f0d2..f11cbd8ef1 100644
--- a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp
+++ b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp
@@ -52,7 +52,7 @@ JS::GCPtr<NavigationTiming::PerformanceTiming> Performance::timing()
 
 double Performance::time_origin() const
 {
-    return static_cast<double>(m_timer.origin_time().milliseconds());
+    return static_cast<double>(m_timer.origin_time().nanoseconds()) / 1e6;
 }
 
 // https://w3c.github.io/user-timing/#mark-method
diff --git a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h
index cdda943ae8..213dbeeef3 100644
--- a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h
+++ b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h
@@ -21,7 +21,7 @@ class Performance final : public DOM::EventTarget {
 public:
     virtual ~Performance() override;
 
-    double now() const { return static_cast<double>(m_timer.elapsed()); }
+    double now() const { return static_cast<double>(m_timer.elapsed_time().to_nanoseconds()) / 1e6; }
     double time_origin() const;
 
     JS::GCPtr<NavigationTiming::PerformanceTiming> timing();