Data validation (dropdowns)

Excel Data Validation on a plain <SvGrid>: Status / Priority / Owner / Sprint columns are list-constrained (double-click for a dropdown), and Estimate must be a whole number 0-40. Four cells arrive invalid and light up red with the reason as a tooltip; fix one and it clears live. Dropdowns are editorType:list + editorOptions; the flag is the declarative validate() hook.

A live, editable Svelte 5 data grid example. Open the interactive demo or read the documentation.