StandardW3C, WCAG 2.2 (1.4.8) (opens the source)3 min read
Line length and line height: what the standard says, and what the research adds
Two settings decide how a block of text feels before anyone reads a word: how wide the lines are and how far apart they sit. The accessibility standard gives a number for each. Here is where those numbers come from, and where the evidence is thinner than the numbers suggest.