How do I detect HiDPI devices running Windows Phone 8?

The phone I'm testing is the Nokia Lumia 920, which has a 4.5-inch 1280 × 768 screen (i.e. > 300 dpi). IE supports min-resolution in CSS but not min-device-pixel-ratio. Using this device pixel density test, the Lumia reports 96 dpi. This is far lower than the actual screen resolution, and would be considered a regular non-HiDPI device.

Since IE doesn't (yet) support window.devicePixelRatio in JavaScript, I can't find a way to accurately detect the Lumia as capable of displaying HiDPI images.

internet-explorer windows-phone-8
Edit
Report