---
title: Performance Observer API
category: api, apps
bugzilla: 1386021
firefox_status: 57
mdn_url: https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver
spec_url: https://w3c.github.io/performance-timeline/#dom-performanceobserver
chrome_ref: 5945504202489856
webkit_ref: Performance Observer
ie_ref: performanceobserver
---

Observes performance measurement events and sends notifications of new performance entries as they are recorded in the browser performance timeline.

---
title: Performance Observer API
category: api, apps
bugzilla: 1386021
firefox_status: 57
mdn_url: https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver
spec_url: https://w3c.github.io/performance-timeline/#dom-performanceobserver
chrome_ref: 5945504202489856
webkit_ref: Performance Observer
ie_ref: Performance Observer
---

Observes performance measurement events and sends notifications of new performance entries as they are recorded in the browser performance timeline.

Fix the IE ref for Performance Observer
Fix the IE ref for Performance Observer