New web developer: So what is a 'px' unit? Old web developer: It stands for 'pixel'. NWD: So 1px is 1 pixel wide? OWD: Oh my no, it has nothing to do with pixels. NWD: ... OWD: ... NWD: Fuck you. OWD: Completely fair.
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... I didn't know this. I'm a little concerned about the CSS I wrote recently...
Don't be. A px is not the same size as a screen pixel, but afaiu it is the same size as a pixel in a raster image that is part of the same document. And arguably that's the only thing that matters. I.e. px scales with the objects in your document that are made of pixels.
