css pixel in different size of monitor

根據w3 standard,  1 inch = 96 px,
呢個比例我係24inch 1920*1080 係岩岩好,
但係iphone 6+ 既96px只係得0.7 inch,  
咁21.5 inch 1920*1080 同 27inch 2560*1440 係咪又會唔同左

做response design 點介定一幅圖要最少要幾大先係唔同device睇得清楚?

冇得介定, 因為你都冇得知人地個mon實際吋數
由得client OS既pixel ratio/dpi自己控制大細就夠

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