html (html) {
        if (!arguments.length) {
            return this._html;
        }
        this._html = html;
        return this;
    }
Get or set the function that formats an item. The data grid widget uses a
function to generate dynamic html. Use your favourite templating engine or
generate the string directly.
@example
chart.html(function (d) { return '<div class='item '+data.exampleCategory+''>'+data.exampleString+'</div>';});
@param {Function} [html]
@returns {Function|DataGrid}