2 files changed, 8 insertions, 0 deletions
diff --git a/cli/dts/lib.deno.shared_globals.d.ts b/cli/dts/lib.deno.shared_globals.d.ts
index 5f44e2d1b..b96c56dba 100644
--- a/cli/dts/lib.deno.shared_globals.d.ts
+++ b/cli/dts/lib.deno.shared_globals.d.ts
@@ -450,6 +450,7 @@ declare class Worker extends EventTarget {
 declare type PerformanceEntryList = PerformanceEntry[];
 
 declare class Performance {
+  readonly timeOrigin: number;
   constructor();
 
   /** Removes the stored timestamp with the associated name. */
diff --git a/cli/tests/unit/performance_test.ts b/cli/tests/unit/performance_test.ts
index 4c7d08d4e..252a31fc4 100644
--- a/cli/tests/unit/performance_test.ts
+++ b/cli/tests/unit/performance_test.ts
@@ -20,6 +20,13 @@ Deno.test({ permissions: { hrtime: false } }, async function performanceNow() {
   assert(totalTime >= 10);
 });
 
+Deno.test(function timeOrigin() {
+  const origin = performance.timeOrigin;
+
+  assert(origin > 0);
+  assert(Date.now() >= origin);
+});
+
 Deno.test(function performanceMark() {
   const mark = performance.mark("test");
   assert(mark instanceof PerformanceMark);