Interactive tutorials and live demos for pretext
(pretext.js) — the zero-dependency JavaScript library by Cheng Lou that measures multiline text
height, line breaks, and width with pure arithmetic. No DOM reads, no layout thrashing, no forced
reflow — hundreds of times faster than getBoundingClientRect().
Note: this is the pretext JavaScript library, not PreTeXt the math-textbook authoring language.
Enable JavaScript for the full interactive experience — a live canvas newspaper where text reflows around draggable images at 60fps.