{font-size} Font Size Property | CSS: Presentation Layer

Standards Based Development

css Baseline Font Sizes

line-height is tied to font-size, which is rooted in browser font-sizing and environmental resolution, while line length is based on width, which is rooted in viewport dimensions

100% = 1 em ~= 16px ~= 14pt

The css Baseline Font Size Equation is shown above; it's a formula that stipulates that at the baseline, before any font sizes have been adjusted by child elements, the default font size (in the browser) is usually approximately 16px, and usually approximately 14pt, but always 100% and 1em.