GPUCommandEncoder: writeTimestamp() method

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

Note: This feature is available in Web Workers.

The writeTimestamp() method of the GPUCommandEncoder interface encodes a command that writes a timestamp into a GPUQuerySet once the previous commands recorded into the same queued GPUCommandBuffer have been executed by the GPU.

Note: To use timestamp queries, the timestamp-query feature must be enabled in the GPUDevice.

Syntax

writeTimestamp(querySet, queryIndex)

Parameters

querySet: A GPUQuerySet object representing the query set that will store the timestamp values.
queryIndex: A number representing the index of the query in the query set.

Return value

None (Undefined).

Validation

The following criteria must be met when calling writeTimestamp(), otherwise a GPUValidationError is generated and the GPUCommandEncoder becomes invalid:

The timestamp-query feature is enabled in the GPUDevice.
The querySet GPUQuerySet.type is "timestamp"
The queryIndex value is less than the GPUQuerySet.count.

Examples

// …

const querySet = device.createQuerySet({
  type: "timestamp",
  count: 32,
});

// …

commandEncoder.writeTimestamp(querySet, 0);

// …

Specifications

This feature does not appear to be defined in any specification.

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	Deno
`writeTimestamp` Deprecated Non-standard	Chrome – No support Chrome 113 – 120 (Release date: 2023-05-02) footnote Removed in 121 and later	Edge – No support Edge 113 – 120 (Release date: 2023-05-05) footnote Removed in 121 and later	Firefox – Partial support Firefox 141 (Release date: 2025-07-22) footnote Partial support footnote Supports all contexts except service workers. See bug 1942431. footnote Supports Windows since Firefox 141. See bug 1972486. footnote Supports macOS Tahoe on Apple silicon since Firefox 145. See bug 1992212. footnote Supports older macOS versions on Apple silicon since Firefox 147. See bug 1993341. footnote Does not support macOS on Intel CPUs. See bug 2004105. footnote Does not support Linux. See bug 2006676.	Opera – No support Opera 99 – 106 (Release date: 2023-05-16) footnote Removed in 107 and later	Safari – No support Safari footnote No support	Chrome Android – No support Chrome Android footnote No support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – No support Opera Android footnote No support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – No support Samsung Internet footnote No support	WebView Android – No support WebView Android footnote No support	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno 1.8 – 1.31 (Release date: 2021-03-02) footnote Removed in 1.32 and later Deno – No support Deno 1.39 (Release date: 2023-12-14) disabled disabled From version 1.39 users must explicitly set the `--unstable-webgpu` runtime flag.

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

Full support: Full support
Partial support: Partial support
No support: No support
: Non-standard. Check cross-browser support before using.
: Deprecated. Not for use in new websites.
: User must explicitly enable this feature.
: Has more compatibility info.

GPUCommandEncoder: writeTimestamp() method

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