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Jerkmate
https://www.caniemail.com/features/css-at-media-device-pixel-ratio/
Can I email… @media (-webkit-device-pixel-ratio)
Supported in Apple Mail. Partially supported in Outlook. Not supported in Gmail, Yahoo! Mail.
device pixel ratiomediawebkit
https://www.campaignmonitor.com/css/media-queries/max-device-pixel-ratio/
max-device-pixel-ratio | Campaign Monitor
The experts at Campaign Monitor created a free CSS tool to help you design pixel perfect email marketing. Learn about max device pixel ratio.
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https://plugins.matomo.org/DevicePixelRatio
Device Pixel Ratio - Matomo Plugins Marketplace
Collects statistics on the device pixel ratio of the visitor's devices. Useful to analyze how many visitors have Retina or other high DPI displays.
device pixel ratiomatomo plugins marketplace