3 files changed, 33 insertions, 6 deletions
diff --git a/components/script/dom/console.rs b/components/script/dom/console.rs
index 13bbe1005a2..6c6dedc9890 100644
--- a/components/script/dom/console.rs
+++ b/components/script/dom/console.rs
@@ -271,18 +271,29 @@ impl Console {
         };
     }
 
-    // https://developer.mozilla.org/en-US/docs/Web/API/Console/time
+    // https://console.spec.whatwg.org/#time
     pub fn Time(global: &GlobalScope, label: DOMString) {
         if let Ok(()) = global.time(label.clone()) {
-            let message = DOMString::from(format!("{}: timer started", label));
+            let message = DOMString::from(format!("{label}: timer started"));
             console_message(global, message, LogLevel::Log);
         }
     }
 
-    // https://developer.mozilla.org/en-US/docs/Web/API/Console/timeEnd
+    // https://console.spec.whatwg.org/#timelog
+    pub fn TimeLog(_cx: JSContext, global: &GlobalScope, label: DOMString, data: Vec<HandleValue>) {
+        if let Ok(delta) = global.time_log(&label) {
+            let message = DOMString::from(format!(
+                "{label}: {delta}ms {}",
+                stringify_handle_values(data)
+            ));
+            console_message(global, message, LogLevel::Log);
+        }
+    }
+
+    // https://console.spec.whatwg.org/#timeend
     pub fn TimeEnd(global: &GlobalScope, label: DOMString) {
         if let Ok(delta) = global.time_end(&label) {
-            let message = DOMString::from(format!("{}: {}ms", label, delta));
+            let message = DOMString::from(format!("{label}: {delta}ms"));
             console_message(global, message, LogLevel::Log);
         }
     }
diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index 2caf00da4cf..a14a750015c 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -2285,6 +2285,21 @@ impl GlobalScope {
         }
     }
 
+    /// Computes the delta time since a label has been created
+    ///
+    /// Returns an error if the label does not exist.
+    pub fn time_log(&self, label: &str) -> Result<u64, ()> {
+        self.console_timers
+            .borrow()
+            .get(label)
+            .ok_or(())
+            .map(|&start| (Instant::now() - start).as_millis() as u64)
+    }
+
+    /// Computes the delta time since a label has been created and stops
+    /// tracking the label.
+    ///
+    /// Returns an error if the label does not exist.
     pub fn time_end(&self, label: &str) -> Result<u64, ()> {
         self.console_timers
             .borrow_mut()
diff --git a/components/script/dom/webidls/Console.webidl b/components/script/dom/webidls/Console.webidl
index fe0435476cb..b6d2d91fd14 100644
--- a/components/script/dom/webidls/Console.webidl
+++ b/components/script/dom/webidls/Console.webidl
@@ -26,6 +26,7 @@ namespace console {
   undefined groupEnd();
 
   // Timing
-  undefined time(DOMString message);
-  undefined timeEnd(DOMString message);
+  undefined time(optional DOMString label = "default");
+  undefined timeLog(optional DOMString label = "default", any... data);
+  undefined timeEnd(optional DOMString label = "default");
 };