Grid systems. Plain CSS.

No runtime, nothing to mount and nothing to destroy. A stylesheet, the custom properties that are its real interface, and a page using it, because you cannot tell whether a measure works until a paragraph and a photograph are competing for the same columns.

AsymmetricColumns Asymmetric

Unequal columns generated from one ratio, with a single vertical axis that every block hangs from
BaselineGrid Baseline

Vertical rhythm where every line in adjacent columns sits on the same rule, including the lines under a photograph
FullBleedTiles Tiles

A grid of tiles running to the edges of the window, ruled by hairlines that are gaps rather than borders
MarginaliaColumns Marginalia

A column of text with a narrow margin beside it, each note held level with the paragraph it belongs to
MasonryColumns Masonry

Items of unequal height packed into columns, with the ordered variant for anything that is read in sequence
OverlapGrid Overlap

Blocks that deliberately share cells, so a title can sit across a photograph without a negative margin anywhere
TwelveColumn Editorial

A twelve column editorial grid of full-bleed bands, with an overlay drawn from the same properties as the layout