Page zoom is the default with a handy keyboard shortcut, Scale factor (or 'pinch zoom') resembles CSSscale transform, Text-only zoom alters font size using rem units.
Device pixels vary in sizes causing inconsistencies, OS abstraction sets resolution different from physical hardware for better readability, double pixel density improves interface visu.
Printers can have higher pixel density than screens, screens have smaller pixels, reliance on physical device pixels would make interfaces too small for higher-resolution devices.
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