diff --git a/Tests/LibWeb/Text/expected/PerformanceObserver/PerformanceObserver_basic.txt b/Tests/LibWeb/Text/expected/PerformanceObserver/PerformanceObserver_basic.txt
index 946e4a8dde..7ee8e15a22 100644
--- a/Tests/LibWeb/Text/expected/PerformanceObserver/PerformanceObserver_basic.txt
+++ b/Tests/LibWeb/Text/expected/PerformanceObserver/PerformanceObserver_basic.txt
@@ -7,8 +7,8 @@ list instanceof PerformanceObserverEntryList: true
 allEntries instanceof Array: true
 allEntries.length === 3: true
 allEntries[0] === startMark: true
-allEntries[1] === endMark: true
-allEntries[2] === measureMark: true
+allEntries[1] === measureMark: true
+allEntries[2] === endMark: true
 markEntries instanceof Array: true
 markEntries.length === 2: true
 markEntries[0] === startMark: true
diff --git a/Tests/LibWeb/Text/input/PerformanceObserver/PerformanceObserver_basic.html b/Tests/LibWeb/Text/input/PerformanceObserver/PerformanceObserver_basic.html
index e3d3d57e7e..a35b890342 100644
--- a/Tests/LibWeb/Text/input/PerformanceObserver/PerformanceObserver_basic.html
+++ b/Tests/LibWeb/Text/input/PerformanceObserver/PerformanceObserver_basic.html
@@ -17,8 +17,8 @@
         printlnBuffered(`allEntries instanceof Array: ${allEntries instanceof Array}`);
         printlnBuffered(`allEntries.length === 3: ${allEntries.length === 3}`);
         printlnBuffered(`allEntries[0] === startMark: ${allEntries[0] === startMark}`);
-        printlnBuffered(`allEntries[1] === endMark: ${allEntries[1] === endMark}`);
-        printlnBuffered(`allEntries[2] === measureMark: ${allEntries[2] === measureMark}`);
+        printlnBuffered(`allEntries[1] === measureMark: ${allEntries[1] === measureMark}`);
+        printlnBuffered(`allEntries[2] === endMark: ${allEntries[2] === endMark}`);
 
         const markEntries = list.getEntriesByType("mark");
         printlnBuffered(`markEntries instanceof Array: ${markEntries instanceof Array}`);
diff --git a/Userland/Libraries/LibWeb/HighResolutionTime/TimeOrigin.cpp b/Userland/Libraries/LibWeb/HighResolutionTime/TimeOrigin.cpp
index de1f1bcdea..0fa27c52d9 100644
--- a/Userland/Libraries/LibWeb/HighResolutionTime/TimeOrigin.cpp
+++ b/Userland/Libraries/LibWeb/HighResolutionTime/TimeOrigin.cpp
@@ -55,7 +55,8 @@ DOMHighResTimeStamp coarsened_shared_current_time(bool cross_origin_isolated_cap
 DOMHighResTimeStamp unsafe_shared_current_time()
 {
     // The unsafe shared current time must return the current value of the shared monotonic clock.
-    return MonotonicTime::now().truncated_seconds();
+    // Note: This is in milliseconds (stored as a double).
+    return MonotonicTime::now().nanoseconds() / 1.0e6;
 }
 
 }