2 files changed, 8 insertions, 3 deletions
diff --git a/components/script/dom/performanceresourcetiming.rs b/components/script/dom/performanceresourcetiming.rs
index 0c7df4d4f80..2457e4f23ba 100644
--- a/components/script/dom/performanceresourcetiming.rs
+++ b/components/script/dom/performanceresourcetiming.rs
@@ -86,8 +86,8 @@ impl PerformanceResourceTiming {
             redirect_start: 0.,
             redirect_end: 0.,
             fetch_start: fetch_start,
-            domain_lookup_start: 0.,
             domain_lookup_end: 0.,
+            domain_lookup_start: 0.,
             connect_start: 0.,
             connect_end: 0.,
             secure_connection_start: 0.,
@@ -118,7 +118,7 @@ impl PerformanceResourceTiming {
             redirect_start: resource_timing.redirect_start as f64,
             redirect_end: 0.,
             fetch_start: resource_timing.fetch_start as f64,
-            domain_lookup_start: 0.,
+            domain_lookup_start: resource_timing.domain_lookup_start as f64,
             domain_lookup_end: 0.,
             connect_start: resource_timing.connect_start as f64,
             connect_end: resource_timing.connect_end as f64,
@@ -172,6 +172,11 @@ impl PerformanceResourceTimingMethods for PerformanceResourceTiming {
         }
     }
 
+    // https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-domainlookupstart
+    fn DomainLookupStart(&self) -> DOMHighResTimeStamp {
+        Finite::wrap(self.domain_lookup_start)
+    }
+
     // https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-requeststart
     fn RequestStart(&self) -> DOMHighResTimeStamp {
         Finite::wrap(self.request_start)
diff --git a/components/script/dom/webidls/PerformanceResourceTiming.webidl b/components/script/dom/webidls/PerformanceResourceTiming.webidl
index 1c9cf1bb8e5..087db5f45cd 100644
--- a/components/script/dom/webidls/PerformanceResourceTiming.webidl
+++ b/components/script/dom/webidls/PerformanceResourceTiming.webidl
@@ -15,7 +15,7 @@ interface PerformanceResourceTiming : PerformanceEntry {
     readonly attribute DOMHighResTimeStamp redirectStart;
     // readonly attribute DOMHighResTimeStamp redirectEnd;
     readonly attribute DOMHighResTimeStamp fetchStart;
-    // readonly attribute DOMHighResTimeStamp domainLookupStart;
+    readonly attribute DOMHighResTimeStamp domainLookupStart;
     // readonly attribute DOMHighResTimeStamp domainLookupEnd;
     readonly attribute DOMHighResTimeStamp connectStart;
     readonly attribute DOMHighResTimeStamp connectEnd;