The measure() method creates a named timestamp in the browser's performance entry buffer between marks, the navigation start time, or the current time. When measuring between two marks, there is a start mark and end mark, respectively. The named timestamp is referred to as a measure.

The measure can be retrieved by one of the Performance interfaces: (getEntries(), getEntriesByName() or getEntriesByType()).

The measure's performance entry will have the following property values:

Note: This feature is available in Web Workers.

Syntax

performance.measure(name);
performance.measure(name, startMark);
performance.measure(name, startMark, endMark);
performance.measure(name, undefined, endMark);

Arguments

name
A DOMString representing the name of the measure.
startMark Optional
A DOMString representing the name of the measure's starting mark. May also be the name of a PerformanceTiming property. If it is omitted than the start time will be the navigation start time.
endMark Optional
A DOMString representing the name of the measure's ending mark. May also be the name of a PerformanceTiming property. If it is omitted, then the current time is used.

Return value

void
 

Example

The following example shows how measure() is used to create a new measure performance entry in the browser's performance entry buffer.

const markerNameA = "example-marker-a"
const markerNameB = "example-marker-b"

// Run some nested timeouts, and create a PerformanceMark for each.
performance.mark(markerNameA);
setTimeout(function() {
  performance.mark(markerNameB);
  setTimeout(function() {

    // Create a variety of measurements.
    performance.measure("measure a to b", markerNameA, markerNameB);
    performance.measure("measure a to now", markerNameA);
    performance.measure("measure from navigation start to b", undefined, markerNameB);
    performance.measure("measure from the start of navigation to now");

    // Pull out all of the measurements.
    console.log(performance.getEntriesByType("measure"));

    // Finally, clean up the entries.
    performance.clearMarks();
    performance.clearMeasures();
  }, 1000);
}, 1000);

Specifications

Specification Status Comment
User Timing Level 2
The definition of 'measure()' in that specification.
Working Draft Clarifies measure() processing model.
User Timing
The definition of 'measure()' in that specification.
Recommendation Basic definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
measureChrome Full support 28
Full support 28
No support 25 — 28
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support 41IE Full support 10Opera Full support 33Safari Full support 11WebView Android Full support 46Chrome Android Full support 28
Full support 28
No support 25 — 28
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Mobile Full support YesFirefox Android Full support 42Opera Android Full support 33Safari iOS Full support 11Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

Document Tags and Contributors

Last updated by: estelle,