diff --git a/src/browser/tests/performance.html b/src/browser/tests/performance.html
index 5928bba9..01d23ab4 100644
--- a/src/browser/tests/performance.html
+++ b/src/browser/tests/performance.html
@@ -252,6 +252,28 @@
   }
 </script>
 
+<script id=measure_with_navigation_timing_marks>
+  {
+    // performance.measure() must accept PerformanceTiming attribute names
+    // (e.g. "fetchStart") as start/end marks per the W3C User Timing Level 2 spec.
+    // https://www.w3.org/TR/user-timing/#dom-performance-measure
+    performance.clearMarks();
+    performance.clearMeasures();
+
+    performance.mark("mark-dataComplete");
+    let m = performance.measure("dataComplete", "fetchStart", "mark-dataComplete");
+    testing.expectEqual('dataComplete', m.name);
+    testing.expectEqual('measure', m.entryType);
+    testing.expectEqual(true, m.duration >= 0);
+
+    // navigationStart is also a valid mark name (was already supported)
+    performance.mark("mark-end");
+    let m2 = performance.measure("fromNav", "navigationStart", "mark-end");
+    testing.expectEqual('fromNav', m2.name);
+    testing.expectEqual(true, m2.duration >= 0);
+  }
+</script>
+
 <script id=mixed_marks_and_measures>
   {
     performance.clearMarks();
diff --git a/src/browser/webapi/Performance.zig b/src/browser/webapi/Performance.zig
index fef02036..78070893 100644
--- a/src/browser/webapi/Performance.zig
+++ b/src/browser/webapi/Performance.zig
@@ -208,9 +208,37 @@ fn getMarkTime(self: *const Performance, mark_name: []const u8) !f64 {
         }
     }
 
-    // Recognized mark names by browsers. `navigationStart` is an equivalent
-    // to 0. Others are dependant to request arrival, end of request etc.
-    if (std.mem.eql(u8, "navigationStart", mark_name)) {
+    // PerformanceTiming attribute names are valid start/end marks per the
+    // W3C User Timing Level 2 spec. All are relative to navigationStart (= 0).
+    // https://www.w3.org/TR/user-timing/#dom-performance-measure
+    //
+    // `navigationStart` is an equivalent to 0.
+    // Others are dependant to request arrival, end of request etc, but we
+    // return a dummy 0 value for now.
+    const navigation_timing_marks = std.StaticStringMap(void).initComptime(.{
+        .{ "navigationStart", {} },
+        .{ "unloadEventStart", {} },
+        .{ "unloadEventEnd", {} },
+        .{ "redirectStart", {} },
+        .{ "redirectEnd", {} },
+        .{ "fetchStart", {} },
+        .{ "domainLookupStart", {} },
+        .{ "domainLookupEnd", {} },
+        .{ "connectStart", {} },
+        .{ "connectEnd", {} },
+        .{ "secureConnectionStart", {} },
+        .{ "requestStart", {} },
+        .{ "responseStart", {} },
+        .{ "responseEnd", {} },
+        .{ "domLoading", {} },
+        .{ "domInteractive", {} },
+        .{ "domContentLoadedEventStart", {} },
+        .{ "domContentLoadedEventEnd", {} },
+        .{ "domComplete", {} },
+        .{ "loadEventStart", {} },
+        .{ "loadEventEnd", {} },
+    });
+    if (navigation_timing_marks.has(mark_name)) {
         return 0;
     }