OS Details

HTC Desire 10 Lifestyle has been launched in September 2016.
HTC Desire 10 Lifestyle have Android 6.0 (Marshmallow)

Screen Dimensions

HTC Desire 10 Lifestyle screen size is 5.5 inch with ~ 69.1% body ratio of actual device size. Physical dimensions for HTC Desire 10 Lifestyle device is 6.18 x 3.03 x 0.30 INCH or ( 156.9 x 76.9 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.

HTC Desire 10 Lifestyle resolution is 720 x 1280 ^PX with ~ 267 pixel desnsity.
HTC Desire 10 Lifestyle viewport size is 360 x 640 ^PX with ~ 134 actual pixel density, which means it have 2 xhdpi 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".

HTC Desire 10 Lifestyle have 5.5" physical screen size and its resolution is about 720 x 1280 Pixels with approximately 267 PPI pixel density. HTC Desire 10 Lifestyle has viewport size 360 x 640 Pixels and its pixel ratio is about 2.

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

CSS Media Queries

HTC Desire 10 Lifestyle Media Queries (In terms of Mobile only)

@media only screen and (min-width: 360px) and (max-width: 767px) { /* Your Styles... */ }

HTC Desire 10 Lifestyle Min-Width Media Queries

@media only screen and (min-width: 360px) { /* Your Styles... */ }

HTC Desire 10 Lifestyle Min-Height Media Queries

@media only screen and (min-height: 640px) { /* Your Styles... */ }

HTC Desire 10 Lifestyle Landscape Media Queries

@media only screen and (min-width: 640px) and (orientation: landscape) { /* Your Styles... */ }

HTC Desire 10 Lifestyle Portrait Media Queries

@media only screen and (min-width: 360px) and (orientation: portrait) { /* Your Styles... */ }

HTC Desire 10 Lifestyle Retina Media Queries

@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: 267dpi),
  only screen and (                min-resolution: 2dppx) { 
    /* 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 */
}
                                

HTC Desire 10 Lifestyle Specifications

• Launch Date September 2016
• Android 6.0 (Marshmallow)
• Physical Screen Size 5.5 INCH
• Resolution 720 x 1280 PX
• Viewport Size 360 x 640 PX
• Pixel Density 267 PPI
• Device-Independent Pixels 134 PPI
• Pixel Ratio 2 xhdpi
• Width 720 PX
• Height 1280 PX
• Device Width 360 PX
• Device Height 640 PX
• Dimensions 156.9 x 76.9 x 7.7 mm (6.18 x 3.03 x 0.30 in)
• Weight 155 g - 5.47 oz