web
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viewport width:
window.innerWidth == viewport.width window.screen.width are screen width in points. window.devicePixelRatio tells how many physical pixels equal 1 css px. 屏幕的宽度比如 360x720 单位是 pt，1 pt 等于 x 英寸。 css 中 1 px = 实际宽度 1 pt。 实际渲染的像素等于：css px * devicePixelRatio * inital-scale ?
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