Question 1

What is screen resolution?

Accepted Answer

Screen resolution is the number of pixels displayed on screen horizontally × vertically (e.g., 1920×1080). Higher resolution means more pixels and sharper images. Common resolutions: HD (1280×720), FHD (1920×1080), 4K (3840×2160).

Question 2

What is a viewport vs screen resolution?

Accepted Answer

Screen resolution is the total display capability of the monitor. Viewport is the visible area inside the browser window. The viewport changes when you resize the browser; screen resolution is fixed by hardware.

Question 3

What is device pixel ratio (DPR)?

Accepted Answer

DPR is the ratio of physical pixels to CSS pixels. Retina/HiDPI displays have DPR of 2 or higher, meaning 4 physical pixels for every CSS pixel, resulting in sharper images at the same logical size.

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