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Developers spend hours tuning the font, size, and theme in their editor, then publish documentation with code blocks set in 12-pixel Courier, cramped

You design a newsletter with a lovely custom typeface, send a test to yourself, and it looks perfect in Apple Mail. Then a colleague forwards a scree

Look at a sign-up form and count the pieces of text that aren't headings or body copy. "Must be at least 8 characters." "We'll never share your email

Open almost any admin panel and you'll find the same problems: numbers in a column that don't line up, a revenue figure that jitters every time it up

You design a page on a 27-inch monitor, check it in the browser's device toolbar, and it looks fine. Then you open it on an actual phone on a sunny a

Most typography advice is written for paragraphs: line length, leading, rhythm, the feel of a long column of text. Then you open a settings screen or