earonesty/boxpdf](https:

CSS-style flex-shrink on hstack / vstack. When intrinsic children exceed the container, items with shrink > 0 give up shares of the overflow proportional to shrink × baseSize — and text re-wraps to fit.

New

• shrink: number on text(), vstack(), hstack(), spacer(). link() forwards its child's weight.
• breakWords: boolean on text() — CSS overflow-wrap: break-word; allows char-level wrap below the longest-word floor.
• maxLines (existing) now also lowers the shrink floor so the engine can ellipsize cleanly into a narrower slot.

Behavior

• Multi-word text floors at its widest whitespace-separated word — never breaks mid-word.
• Single-token strings (URLs, hashes, identifiers) overflow visibly by default. Opt in to truncation (maxLines: 1) or char-break (breakWords: true).
• Iterative weight redistribution when an item hits its floor — CSS flexbox semantics.
• Vertical shrink fires when a vstack has a fixed height smaller than the sum of its children.
• resolveMainAxis exported for layout consumers.

Other

• Debug overlay strokes now sit fully outside the content box, so glyphs at the box edge never visually overlap the stroke.

Tests

89/89 passing (24 new for flex-shrink). Verified end-to-end on Cloudflare Workers.

See examples/flex-shrink.ts for a runnable showcase.