comark/charts/invalid-at · Point every chart annotation at a row with at

An annotation marks the row whose x value its at names, copied from the table as it's written there. Without at, or with a value the table doesn't have, the mark isn't drawn. On a gantt where a task repeats across groups, series names the group of the row it marks, and without it the mark goes on the first.

Incorrect

::chart{title="Ducks per pond"}
| pond | ducks |
| --- | --: |
| north | 12 |
| south | 7 |
| east | 9 |
:::annotation{at="North"}
A family of eight moved in on Tuesday.
:::
::

lint-comark example.mdexample.md:1:1 comark/charts/invalid-at::chart 1, annotation 1: at="North" isn't a pond in the table.Copy it from the table, such as north, south, east.✖ 1 problem

Correct

::chart{title="Ducks per pond"}
| pond | ducks |
| --- | --: |
| north | 12 |
| south | 7 |
| east | 9 |
:::annotation{at="north"}
A family of eight moved in on Tuesday.
:::
::

lint-comark example.md✔ No problems