1280px1920px2560px3840px7680pxScreen dimensions, viewport size and device pixel ratio come from browser APIs. Reading them together explains more than a single width-and-height number, particularly on scaled or high-density displays.
The logical screen size describes the screen coordinate space exposed to the browser. The viewport describes the area currently available to this page. Browser controls, window size and on-screen interfaces can make the viewport smaller. Resize the window and compare both readings to see the distinction directly.
DPR expresses a relationship between device pixels and CSS pixels. Multiplying logical dimensions by DPR gives a useful estimate, but operating-system scaling, browser zoom and display arrangements affect the reported values. Confirm a panel's native resolution in its documentation or system settings rather than treating that estimate as a hardware specification.
Color-gamut and dynamic-range media queries describe what the browser reports for its current rendering environment. They do not measure gamut coverage, peak brightness or calibrated color accuracy. Use the detailed view to understand the available hints, then open the corresponding visual pattern if you want to inspect the result.
Browser dimensions are logical; multiplying them by DPR still gives an estimate.
Read the source labels beside each value.
Resize the window and watch the viewport information update.
Cross-check with system settings and panel specifications.
Patterns support visual inspection. Quantitative color accuracy, brightness, gamut coverage and response time require appropriate instruments and methods.
No. It provides display test patterns and browser information. Screen anomalies that persist at the same position need visual inspection and, when needed, professional assessment.
Open the patterns and guides for your device. True full screen and touch depend on the browser; an immersive page preview remains available when full screen is unsupported.
No installation is needed. Patterns, calculations and interactions run locally in your browser; theme preferences stay on your device.
Rule out dust, reflections and display settings. Repeat under the same conditions, photograph defects that remain in the same screen position and check the device warranty policy.