PerformancePaintTiming - Web APIs
the performancepainttiming interface of the paint timing provides timing information about "paint" (also called "render") operations during web page construction.
... specifications specification status comment paint timingthe definition of 'performancepainttiming' in that specification.

First paint - MDN Web Docs Glossary: Definitions of Web-related terms
first paint, part of the paint timing api, is the time between navigation and when the browser renders the first pixels to the screen, rendering anything that is visually different from what was on the screen prior to navigation.

Index - MDN Web Docs Glossary: Definitions of Web-related terms
151 first paint beginner, glossary, performance, web performance first paint, part of the paint timing api, is the time between navigation and when the browser renders the first pixels to the screen, 152 first-class function codingscripting, glossary, javascript a programming language is said to have first-class functions when functions in that language are treated like any other variable.

Index - Web APIs
3028 performancepainttiming api, interface, paint timing, performance timeline api, performancepainttiming, reference, web performance the performancepainttiming interface of the paint timing provides timing information about "paint" (also called "render") operations during web page construction.