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<resolution>

The <resolution> CSS data type, used for describing resolutions in media queries, denotes the pixel density of an output device, i.e., its resolution.

On screens, the units are related to CSS inches, centimeters, or pixels, not physical values.

Syntax

The <resolution> data type consists of a strictly positive <number> followed by one of the units listed below. As with all CSS dimensions, there is no space between the unit literal and the number.

Units

dpi
Represents the number of dots per inch. Screens typically contains 72 or 96 dots per inch, but the dpi for printed documents is usually much greater. As 1 inch is 2.54 cm, 1dpi ≈ 0.39dpcm.
dpcm
Represents the number of dots per centimeter. As 1 inch is 2.54 cm, 1dpcm ≈ 2.54dpi.
dppx
Represents the number of dots per px unit. Due to the 1:96 fixed ratio of CSS in to CSS px, 1dppx is equivalent to 96dpi, which corresponds to the default resolution of images displayed in CSS as defined by image-resolution.
x
Alias for dppx.

Note: Although the number 0 is always the same regardless of unit, the unit may not be omitted. In other words, 0 is invalid and does not represent 0dpi, 0dpcm, or 0dppx.

Examples

Use in a media query

@media print and (min-resolution: 300dpi) { ... }

Valid resolutions

96dpi
50.82dpcm
3dppx

Invalid resolutions

72 dpi     Spaces are not allowed between the number and the unit.
ten dpi    The number must use digits only.
0          The unit is required.

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
<resolution> 29 12 8
8
3.5
Supports <integer> values only.
9 9.5 No
No
See bug 78087.
dpcm unit 29 12 8 9 16
16
10 — 15
No
dpi unit 29 12 8 9 16
16
10 — 15
No
dppx unit 29 12 16 No 12.1 No
x unit 68 79 62 No 55 No
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
<resolution> ≤37 29 8
8
4
Supports <integer> values only.
10.1 No
No
See bug 78087.
2.0
dpcm unit ≤37 29 8 16
16
10.1 — 14
No 2.0
dpi unit ≤37 29 8 16
16
10.1 — 14
No 2.0
dppx unit ≤37 29 16 12.1 No 2.0
x unit 68 68 62 48 No 10.0

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/resolution