Found by headless e2e smoke pass. border-style: dashed and border-style: dotted paint as solid lines.
Repro#
cargo run -p we-e2e -- --url crates/e2e/pages/02_box_model.html --out /tmp/box.png
See crates/e2e/artifacts/02_box_model.png: the inner box has border: 2px dashed red but is painted with a solid 2px red line.
Acceptance#
border-style: dashed produces interrupted segments (UA default dash length acceptable). border-style: dotted produces a series of dots. border-style: double (likely also broken — not yet tested) produces two parallel lines.