Using a relative unit such as EM is a great way to maintain the vertical rhythm of a web page when a user resizes text in their browser. Constantly reaching for a calculator to compute the correct EM value to use every time you need to is also a great way to drive yourself mad. Letâs say you have an H3 thatâs 24 pixels. It doesnât matter how the font-size is set (pixels, EMs, percentages, etc). Yo
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