nestable - Collapsible 'HTML' Tables from Hierarchical Data

Creates collapsible, expandable 'HTML' tables from hierarchical data. Supports data frame input with multi-level grouping, custom column formatters, bottom-up rollup aggregation, and CSS-variable-based theming. Works in 'Shiny' applications, R Markdown, 'Quarto', and the 'RStudio' Viewer.