The gap between what your hardware claims and what the browser actually gets.
Browser zoom looks like 100% — this changes your viewport and can be the hidden cause of a layout bug. Reset with Ctrl/Cmd + 0.
Compare my display to:
CSS-pixel viewport — what media queries see
—
The drawable space inside the browser window, in CSS pixels.
Measured refresh rate
measuring…
What the browser is currently rendering at — may be capped below the panel's max by the OS, cable, or vsync.
Browser zoom & pixel ratio
—
Zoom is estimated from a fixed physical-size probe, separate from DPR. Other tools blend these together; here they're split so a 125% zoom isn't mistaken for a Retina screen.
Screen & physical pixels
—
Screen (CSS)—
Available—
Device pixel ratio—
Active breakpoint — Tailwind defaults
Color & HDR
Widest gamut—
Dynamic range—
Color depth—
Browser-reported capability — depends on OS, cable, and display all being configured correctly.