Columns

Tier

directive

Surfaces

pagesidebarwidget

Fallback

literal

State

settled

A layout container with no native Markdown equivalent anywhere. The outer fence carries one more colon than anything inside it; dragged widths ride an invisible comment as percent shares, one per column.

<!--sb widths="60% 40%"-->

::::columns
:::col
Left words.
:::
:::col
Right words.
:::
::::

Fallback: the fences show as punctuation lines, the content inside stays ordinary readable Markdown. This is the accepted cost of the one construct that cannot degrade invisibly; nothing a person wrote is hidden.