| ascent | The ascent ratio of the font height (default is 0.8). |
| inset | The inset to use for cell text. |
| numformat | The format to use for numbers. |
| selColor | The background color for selected cells. |
| computeSize(elt) | |
| draw(elt, x, w, h, selected) | Draw data (e.g. a table element) into a cell. |