- A non-standardized web performance “progress” metric defined as the point in time when the last long task finished and was followed by five seconds of network and main thread inactivity. TTI, proposed by the Web Incubator Community Group (WICG) in 2018, is intended to provide a metric that describes when a page or application contains useful content and the main thread is idle and free to respond to user interactions, including having event handlers registered. ← MDN Web Docs
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