Deep dive into CSS absolute units—pixels (px), points (pt), and centimeters (cm)—what they are, when to use each, and how they differ from relative units. Covers px basics (96px = 1in), pt for typography, cm for print, considerations for desktop/mobile/HiDPI, plus practical tips: base px + rem scaling, viewport units (vw/vh), and media queries targeting high‑DPI for pixel‑perfect control.
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