Performance: clearMarks() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2017.

See full compatibility

Note: This feature is available in Web Workers.

The clearMarks() method removes all or specific PerformanceMark objects from the browser's performance timeline.

Syntax

clearMarks()
clearMarks(name)

Parameters

name Optional: A string representing the name of the PerformanceMark object. If this argument is omitted, all entries with an entryType of "mark" will be removed.

Return value

None (undefined).

Examples

Removing markers

To clean up all performance marks, or just specific entries, use the clearMarks() method like this:

// Create a bunch of marks
performance.mark("login-started");
performance.mark("login-started");
performance.mark("login-finished");
performance.mark("form-sent");
performance.mark("video-loaded");
performance.mark("video-loaded");

performance.getEntriesByType("mark").length; // 6

// Delete just the "login-started" mark entries
performance.clearMarks("login-started");
performance.getEntriesByType("mark").length; // 4

// Delete all of the mark entries
performance.clearMarks();
performance.getEntriesByType("mark").length; // 0

Specifications

Specification
User Timing # dom-performance-clearmarks

Browser compatibility

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`clearMarks`	Chrome – No support Chrome 25 – 28 (Release date: 2013-02-21) prefix prefix Implemented with the vendor prefix: webkit Chrome – Full support Chrome 29 (Release date: 2013-08-20) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 38 (Release date: 2015-05-12) footnote Full support	Opera – Full support Opera 33 (Release date: 2015-10-27) footnote Full support	Safari – Full support Safari 11 (Release date: 2017-09-19) footnote Full support	Chrome Android – No support Chrome Android 25 – 28 (Release date: 2013-02-27) prefix prefix Implemented with the vendor prefix: webkit Chrome Android – Full support Chrome Android 29 (Release date: 2013-08-21) footnote Full support	Firefox for Android – Full support Firefox for Android 42 (Release date: 2015-11-03) footnote Full support	Opera Android – Full support Opera Android 33 (Release date: 2015-11-03) footnote Full support	Safari on iOS – Full support Safari on iOS 11 (Release date: 2017-09-19) footnote Full support	Samsung Internet – No support Samsung Internet 1.5 – 1.6 (Release date: 2013-09-25) prefix prefix Implemented with the vendor prefix: webkit Samsung Internet – Full support Samsung Internet 2 (Release date: 2014-10-17) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 11 (Release date: 2017-09-19) footnote Full support	Bun – Full support Bun 1.0.22 (Release date: 2024-01-10) footnote Full support	Deno – Full support Deno 1.2 (Release date: 2020-07-13) footnote Full support	Node.js – Full support Node.js 8.5 (Release date: 2017-09-12) footnote Full support

Tip: you can click/tap on a cell for more information.

Full support: Full support
: Requires a vendor prefix or different name for use.
: Has more compatibility info.

Performance: clearMarks() method

Legend