coderef

Server timingBaseline · Widely available

The serverTiming property of a resource performance entry contains server timing information about network requests.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Mar 27, 2023. Widely available since Sep 27, 2025.

How to use ↓Compare browsers

Browser support

DesktopChrome
1–64Not supported
65+Supportedsince Mar 6, 2018
Current: 155
Edge
12–18Not supported
79+Supportedsince Jan 15, 2020
Current: 154
Firefox
1–60Not supported
61+Supportedsince Jun 26, 2018
Current: 157
Safari
1–16.3Not supported
16.4+Supportedsince Mar 27, 2023
Current: 27
MobileChrome Android
18–64Not supported
65+Supportedsince Mar 6, 2018
Current: 155
Firefox Android
4–60Not supported
61+Supportedsince Jun 26, 2018
Current: 157
Safari iOS
1–16.3Not supported
16.4+Supportedsince Mar 27, 2023
Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: serverTiming.

Feature detection

JS · check before using
if ("PerformanceResourceTiming" in globalThis && "serverTiming" in PerformanceResourceTiming.prototype) {
  // PerformanceResourceTiming.serverTiming is available
}

Documentation (MDN)

Specification

Usage share

Sub-features

Support for each part of the feature (8). The overall table above shows when the whole feature works.

Sub-featureChromeEdgeFirefoxSafariChrome AndroidFirefox AndroidSafari iOS
PerformanceResourceTiming.serverTiming65796116.4656116.4
PerformanceServerTiming65796116.4656116.4
PerformanceServerTiming.description65796116.4656116.4
PerformanceServerTiming.duration65796116.4656116.4
PerformanceServerTiming.name65796116.4656116.4
PerformanceServerTiming.toJSON65796116.4656116.4
http.headers.Server-Timing65796116.4656116.4
http.headers.Server-Timing.trailer✕✕71✕✕79✕