Glossary term
What is field data? Meaning for developers
Measurements from real users' browsers (RUM, CrUX). They tell you if there is a problem and who has it.
Learn it properly · Scenario DebuggingLesson 0: The Debugging Method: Measure, Isolate, Hypothesize, VerifyThe method every answer in this series uses: which DevTools panel or server number answers which question, and how to explain your choices out loud.