I usually explain px by saying to think of it as "1/72" of an inch. Prior to "retina" and other pixel dense screens, it was simply one pixel on the screen. However it doesn't really mean that anymore.
I still encounter people who were told never to use px. However, if you use the "computed" panel in the web inspector, you can see that, ultimately, all units of measurement get converted to pixels anyway. That doesn't mean that other units don't have their advantages, but I do tend to use pixels most of the time. With a few exceptions.
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I usually explain px by saying to think of it as "1/72" of an inch. Prior to "retina" and other pixel dense screens, it was simply one pixel on the screen. However it doesn't really mean that anymore.
I still encounter people who were told never to use px. However, if you use the "computed" panel in the web inspector, you can see that, ultimately, all units of measurement get converted to pixels anyway. That doesn't mean that other units don't have their advantages, but I do tend to use pixels most of the time. With a few exceptions.