consider standardizing `-` and `_`

[alixander]

we have sequence_diagram and sql_table, but also font-color and target-arrowhead.

should consider standardizing for next major version.

[bo-ku-ra]

my understanding (might be wrong..);

. = elements separator
<-> = connector
_ = alternative space

style.font-size: (origin css)
style.font-color: (origin css)
style.fill: (origin svg)
style.stroke: (origin svg)
sequence_diagram (origin d2)
target-arrowhead (origin d2)

---

my suggestion;
style.font-size (css-like)
style.font-color (css-like)
style.stroke-color (css-like)
style.background-color (css-like)
sequence_diagram (d2)
target_arrowhead (d2)

stroke-width
stroke-dash
...