First Public Working Draft: Long Animation Frames API

Long Animation Frames API

https://www.w3.org/TR/2026/WD-long-animation-frames-20260428/

Published by
 Web Performance Working Group

Abstract

This document defines an API that web page authors can use to detect presence of "long animation frames" that monopolize the UI thread for extended periods of time and block other critical tasks from being executed - e.g. reacting to user input.

Status of the Document

This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C standards and drafts index. 

This document was published by the Web Performance Working Group as a First Public Working Draft using the Recommendation track. Publication as a First Public Working Draft does not imply endorsement by W3C and its Members. 

This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than a work in progress. 

GitHub Issues are preferred for discussion of this specification. 

This document is governed by the 18 August 2025 W3C Process Document. 

This document was produced by a group operating under the W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent that the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy. 

If you wish to make comments regarding this document, please create an issue in the Long Animation Frames repository.

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Received on Tuesday, 28 April 2026 05:51:34 UTC