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css中pt和px如何计算

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css中pt和px如何计算

电脑dpi为96，按照定义，1pt=1/72英寸,1px=1/96英寸，则1pt=4/3px。
屏幕分辨率为1920*1080px，横向铺满一屏需要1440pt，也就是20英寸。
image.png
那么问题来了，我的笔记本是13.9英寸的，横边怎么可能比对角线还长？
1590671064(1).jpg


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此px非彼px，css里的px是1/96英寸，但屏幕规格里的px是物理像素点，要不然怎么13寸显示器和6寸的手机屏幕都是1080p呢？


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