I'm a Systems Reliability and DevOps engineer for Netdata Inc. When not working, I enjoy studying linguistics and history, playing video games, and cooking all kinds of international cuisine.
In visual display media, alwaysrem, except on the root of the document (where I usually use pixels because they are de-facto consistent across all platforms. Using rems means that the site layout works correctly no matter how much zoom the user uses, because it all scales together.
For print media it gets a bit trickier. I would normally use points there because most printers will know how to handle that correctly without multiple unit conversions (unlike other absolute units which may or may not need to be converted twice). I might use ems if I need to offset size relative to the parent font size for some reason, but would probably not use relative units for anything else, instead relying on the (sane) assumption that people are printing at the 'correct' size (and obviously handle margins correctly so that I don’t need to handle separate styles for US and ISO paper sizes).
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In visual display media, always
rem, except on the root of the document (where I usually use pixels because they are de-facto consistent across all platforms. Usingrems means that the site layout works correctly no matter how much zoom the user uses, because it all scales together.For print media it gets a bit trickier. I would normally use points there because most printers will know how to handle that correctly without multiple unit conversions (unlike other absolute units which may or may not need to be converted twice). I might use
ems if I need to offset size relative to the parent font size for some reason, but would probably not use relative units for anything else, instead relying on the (sane) assumption that people are printing at the 'correct' size (and obviously handle margins correctly so that I don’t need to handle separate styles for US and ISO paper sizes).