Question 1

What is screen resolution?

Accepted Answer

Screen resolution is the number of pixels your display can show, expressed as width x height (e.g. 1920x1080). Higher resolution means more detail and sharper images. Your physical screen resolution may differ from your effective resolution if display scaling is enabled.

Question 2

What is the difference between screen resolution and viewport size?

Accepted Answer

Screen resolution is the total pixels of your physical display. Viewport size is the visible area of the browser window where web content is rendered, excluding browser toolbars, scrollbars, and OS taskbars. Viewport is always smaller than or equal to screen resolution.

Question 3

What is device pixel ratio?

Accepted Answer

Device pixel ratio (DPR) is the ratio between physical pixels and CSS pixels. A DPR of 2 (common on Retina displays) means each CSS pixel is rendered using 4 physical pixels (2x2), resulting in sharper text and images. Standard displays have a DPR of 1.

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