"name":"Use cascading dropdowns in web part properties",
"description":"When designing the property pane for your SharePoint client-side web parts, you may have one web part property that displays its options based on the value selected in another property.",
"name":"Build your first SharePoint client-side web part",
"description":"Client-side web parts are client-side components that run in the context of a SharePoint page. Client-side web parts can be deployed to SharePoint environments that support the SharePoint Framework. You can also use modern JavaScript web frameworks, tools, and libraries to build them.",