OS Details

Apple iPhone 13 Pro will be launched in September 2021.
Apple iPhone 13 Pro have iOS 15, upgradable to iOS 15.3

Screen Dimensions

Apple iPhone 13 Pro screen size is 6.1 inch with ~ 86.0% body ratio of actual device size. Physical dimensions for Apple iPhone 13 Pro device is 5.78 x 2.81 x 0.30 INCH or ( 146.7 x 71.5 x 7.7 MM).

Displaying of Units are in this order "Height x Width x Thickness"

Screen Pixel Density and CSS Pixel Ratio

"Pixel" is smallest unit/element of any display.

The total number of pixels that fit into an inch is referred to as "Screen Density" or "Pixel Density" and it measured as "Pixels Per Inch".
Pixel Desnsity have limits to display Pixels Per Inch depends on different screen sizes. When number of pixels per inch increases than it's screen-size limit, the Display resolution will increase but actual device width/height in pixels remain same. Actual device pixels are known as Device Independent Pixels or CSS Pixel Ratio.

Apple iPhone 13 Pro resolution is 1170 x 2532 ^PX with ~ 460 pixel desnsity.
Apple iPhone 13 Pro viewport size is 390 x 844 ^PX with ~ 153 actual pixel density, which means it have 3 xxhdpi display pixel density.

Screen Resolution and Viewport

The sum of pixels which are displaying on a device is called as "Screen Resolution". and sum of actual pixels of any device is reffered to as "Viewport".

Apple iPhone 13 Pro have 6.1" physical screen size and its resolution is about 1170 x 2532 Pixels with approximately 460 PPI pixel density. Apple iPhone 13 Pro has viewport size 390 x 844 Pixels and its pixel ratio is about 3.

For better understanding screen actual sizes, viewport sizes, display resolution and about their density click here.

CSS Media Queries

Apple iPhone 13 Pro Media Queries (In terms of Mobile only)

@media only screen and (min-width: 390px) and (max-width: 767px) { /* Your Styles... */ }

Apple iPhone 13 Pro Min-Width Media Queries

@media only screen and (min-width: 390px) { /* Your Styles... */ }

Apple iPhone 13 Pro Min-Height Media Queries

@media only screen and (min-height: 844px) { /* Your Styles... */ }

Apple iPhone 13 Pro Landscape Media Queries

@media only screen and (min-width: 844px) and (orientation: landscape) { /* Your Styles... */ }

Apple iPhone 13 Pro Portrait Media Queries

@media only screen and (min-width: 390px) and (orientation: portrait) { /* Your Styles... */ }

Apple iPhone 13 Pro Retina Media Queries

@media
  only screen and (-webkit-min-device-pixel-ratio: 3),
  only screen and (   min--moz-device-pixel-ratio: 3),
  only screen and (     -o-min-device-pixel-ratio: 3/1),
  only screen and (        min-device-pixel-ratio: 3),
  only screen and (                min-resolution: 460dpi),
  only screen and (                min-resolution: 3dppx) { 
    /* Retina styles here */
}
                                

Retina is actually based upon device pixel ratio. Devices mostly have 2x or 3x display so you can use general retina media queries to display high resolution content on all kind of devices. Retina 2x and Retina 3x media queries given below:

Retina 2x Media Query

@media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) { 
    /* Retina styles here */
}
                                

Retina 3x Media Query

@media
  only screen and (-webkit-min-device-pixel-ratio: 3),
  only screen and (   min--moz-device-pixel-ratio: 3),
  only screen and (     -o-min-device-pixel-ratio: 3/1),
  only screen and (        min-device-pixel-ratio: 3),
  only screen and (                min-resolution: 384dpi),
  only screen and (                min-resolution: 3dppx) { 
    /* Retina styles here */
}
                                

Apple iPhone 13 Pro Specifications

• Launch Date September 2021
• iOS 15.0
• Physical Screen Size 6.1 INCH
• Resolution 1170 x 2532 PX
• Viewport Size 390 x 844 PX
• Pixel Density 460 PPI
• Device-Independent Pixels 153 PPI
• Pixel Ratio 3 xxhdpi
• Width 1170 PX
• Height 2532 PX
• Device Width 390 PX
• Device Height 844 PX
• Dimensions 146.7 x 71.5 x 7.7 mm (5.78 x 2.81 x 0.30 in)
• Weight 204 g - 7.20 oz