en W3C - Web Performance Working Group The mission of the Web Performance Working Group is to provide methods to measure aspects of application performance of user agent features and APIs. Fri, 22 May 2026 21:24:50 +0000 Laminas_Feed_Writer 2 (https://getlaminas.org) https://www.w3.org/groups/wg/webperf/ First Public Working Draft: Long Animation Frames API Tue, 28 Apr 2026 05:47:00 +0000 https://www.w3.org/news/2026/first-public-working-draft-long-animation-frames-api/ https://www.w3.org/news/2026/first-public-working-draft-long-animation-frames-api/

The Web Performance Working Group published today a First Public Working Draft of Long Animation Frames API. 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.