The inbox is contact@screenlama.com. A person reads it.
A browser or device where fullscreen, wake lock or the color rendering misbehaves — include the browser name and what you saw. A display-testing situation the guided tests don't cover. A job you use a blank screen for that we haven't thought of; the best features on this site started as somebody's odd habit.
Verdicts on your specific panel — we can't see it, and anyone who claims to diagnose a display over email is guessing. The tests here give you the evidence; your manufacturer's pixel policy gives the ruling.