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This document uses PHP Chinese website manual Release
普通屏幕通常包含96dpi，一般将2倍于此的屏幕称之为高分屏，即大于等于192dpi的屏幕，比如Mac视网膜屏就达到了192dpi（即2dppx），打印时一般会需要更大的dpi；
1dppx = 96dpi
1dpi ≈ 0.39dpcm
1dpcm ≈ 2.54dpi
1in = 2.54cm = 25.4 mm = 101.6q = 72pt = 6pc = 96px
示例代码：
@media screen and (min-resolution: 96dpi) { ... }
@media print and (min-resolution: 300dpi) { ... }| IE | Firefox | Chrome | Safari | Opera | iOS Safari | Android Browser | Android Chrome |
|---|---|---|---|---|---|---|---|
| 6.0-8.0 | 2.0-3.4 | 4.0-28.0 | 3.1-8.1 | 15.0+ | 3.2-8.1 | 2.1-4.4.4 | 18.0-29.0 |
| 9.0+ | 3.5+ | 29.0+ | 29.0+ |
<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>dpi_CSS参考手册_web前端开发参考手册系列</title>
<meta name="author" content="Joy Du(飘零雾雨), dooyoe@gmail.com, www.doyoe.com" />
<style>
@media screen and (min-resolution: 192dpi) {
.normal{display:none;}
}
@media screen and (min-resolution: 72dpi) and (max-resolution: 191dpi) {
.retina{display:none;}
}
</style>
</head>
<body>
<p class="retina">视网膜屏</p>
<p class="normal">普通屏</p>
</body>
</html>
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