Add HTMLElement support

abstract-table.ts

@@ -149,6 +149,13 @@ export abstract class Table<TRow extends object> {
             const cell: HTMLTableCellElement = document.createElement("td");
             const value = data[column.key]
 
+            // Element values are inserted as children, not stringified.
+            if (value instanceof HTMLElement) {
+                cell.appendChild(value);
+                row.append(cell);
+                continue;                 // skip the textContent path that would wipe it
+            }
+
             let cellValue = "";
 
             switch (column.type) {