Resolution, pixel density, color range, and a measured — not marketed — refresh rate. No app install, no driver panel.
Color gamut and dynamic range come from CSS media queries your browser evaluates against the actual panel — color-gamut and dynamic-range. Support is real but uneven: Chrome and Edge report both fairly reliably, Safari reports gamut but not always dynamic range, and older Firefox reports neither. "Not reported by this browser" below means exactly that — not "your screen can't do it," just that this browser won't say.
Device pixel ratio is how many actual screen pixels stand behind one CSS pixel. A ratio of 1 is a standard desktop monitor; 2 is what Apple calls Retina and most flagship phones use; 3 shows up on some Android phones and the largest iPhones. It's the number that explains why a 1080p phone screen can look sharper than a 1080p monitor three times its size — the phone is drawing more actual pixels per inch of layout.