¿Cuántos píxeles tiene una pulgada CSS?

How many pixels is an inch CSS?

96 CSS pixels
CSS inch (in) On a computer screen, a CSS inch has nothing to do with the physical inch. Instead, it is being redefined to be exactly equal to 96 CSS pixels.

96 pixels
1 inch = PPI . That’s it! If PPI equals 96, one inch has 96 pixels.

Since a CSS pixel size doesn’t necessarily correspond with a device pixel size, I assume that the unit size on the Retina display is firstly translated into a reference pixel size (expressed in device pixels) and then multiplied by pixel ratio.

A pt is 1/72 of an in, and a px is 1/96 of an in. A px is therefore 0.75 pt [source]. In CSS, everything is somewhat abstracted, so a unit such as a “pt” is not necessarily one point in physical size, especially on a screen, an “in” is not necessarily one inch in size, and so forth.

The term CSS pixel is synonymous with the CSS unit of absolute length px — which is normatively defined as being exactly 1/96th of 1 inch.

A point (pt) is equal to 0.352778 millimeters, 0.0138889 inches, or 1.333 pixels. Because millimeters and inches are measurements of physical items, they are not ideal to use with computer or mobile based applications because they dont always represent the correct size because of differences in screen resolution.

Use em or px for font sizes In CSS there is no reason to use pt , use whichever unit you prefer. But there is a good reason to use neither pt nor any other absolute unit and only use em and px .

As a result, a CSS ‘px’ unit (because it is 1/96 of an inch) may resolve to a fractional number of device pixels. For example, on a 300dppi (device pixel per inch) screen the ratio of device pixels to CSS pixels pixels is 300/96 = 3.125. As a consequence, if you styled an element with: border: 1px solid blue;

On a computer screen, a CSS inch has nothing to do with the physical inch. Instead, it is being redefined to be exactly equal to 96 CSS pixels. This has resulted in an awkward situation, where you can never reliably draw an accurate ruler on the screen with basic CSS units [4].

Pixel units are relative to the resolution of the viewing device, i.e., most often a computer display. If the pixel density of the output device is very different from that of a typical computer display, the user agent should rescale pixel values. Typically, 1 pixel on the device will be the same as 1 pixel in CSS.

Logical pixels are defined as the number of physical pixels in a device’s screen divided by the CSS pixel ratio, and logical pixels are what you see when you look at your device (and more importantly, what your browser sees).