Maximum Width of jQuery UI Tooltip widget

Based on Senni's reply, I added following to a separate CSS-file:

div.ui-tooltip {
    max-width: 400px;
}

A sidenote: Make sure your separate CSS follows after the ui-css, otherwise there will be no effect. Otherwise you also could use the !important - marker.

If you subscribe to Tooltip's open event, you can update the style in code:

$(".selector").tooltip({
    open: function (event, ui) {
        ui.tooltip.css("max-width", "400px");
    }
});