line

Use for ordered x with numeric y — trends over time or sequenced categories. Optional series draws multiple strokes.

Do not use for unordered category comparison (bar), filled bands (area), or raw sample distributions (hist).

Optional layout: grouped | stacked | percent. Stacked/percent use cumulative y.

x ordered category or number · y number · series optional; layout as bar

Rules. Keep input row order. An empty y is a gap. The line does not connect through it and does not drop to zero. Stacked and percent require every cell.

Example

markvis: 2
type: line
title: Revenue trend
x: month
y: revenue

month,revenue
Jan,120
Feb,180
Mar,150

Revenue trend

month	revenue
Jan	120
Feb	180
Mar	150

When the block is wrong

The rows stay, with one line that names the error.

markvis: 2
type: line
foo: bar
title: Unknown extra field
x: month
y: revenue

month,revenue
Jan,120
Feb,180

month	revenue
Jan	120
Feb	180

E_UNKNOWN_FIELD: undeclared fence field: foo

Generated from packages/types/line/ and the type's row in SPEC.md.