What do the values in the attribution object mean when analyzing element-level INP scores with Google's Web Vitals library?

Question

I am using Google's official Web Vitals JavaScript library to dig into element-level issues on some pages which have low INP scores. And thus, I am including the attribution build.

In the console, I got this:

Is there any official documents to explain the meaning of each value in the attribution object above?

Answer 1

The objects are detailed on the README page of the library: https://github.com/GoogleChrome/web-vitals?tab=readme-ov-file#inp-attribution

The eventEntry is the PerformanceEventTiming for the INP event and is documented on MDN: https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEventTiming